{"id":29986,"date":"2026-08-11T07:00:44","date_gmt":"2026-08-11T05:00:44","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=29986"},"modified":"2026-08-10T23:26:10","modified_gmt":"2026-08-10T21:26:10","slug":"le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/","title":{"rendered":"Le Sahel reverdit et retrouve de l\u2019eau apr\u00e8s plusieurs d\u00e9cennies de s\u00e9cheresse"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<h2>Le Sahel reverdit : vers le retour d\u2019une \u00e8re humide aux portes du Sahara ?<\/h2>\n<p>Pendant des d\u00e9cennies, le Sahel a \u00e9t\u00e9 l\u2019un des symboles mondiaux de la s\u00e9cheresse, de la d\u00e9sertification et des famines. Pourtant, quelque chose est en train de changer au sud du Sahara. Les pluies reviennent, parfois avec une violence extr\u00eame, les nappes phr\u00e9atiques remontent, certains lacs regagnent du terrain et la v\u00e9g\u00e9tation se d\u00e9veloppe \u00e0 nouveau dans des secteurs autrefois tr\u00e8s arides.<\/p>\n<p>Ce spectaculaire changement hydrologique ne r\u00e9sulte toutefois pas d\u2019une seule cause. Le r\u00e9chauffement climatique, la modification de la mousson africaine, la diminution de certains polluants atmosph\u00e9riques li\u00e9s notamment au charbon et les transformations de l\u2019usage des sols semblent agir simultan\u00e9ment.<\/p>\n<p>Certains chercheurs commencent m\u00eame \u00e0 se demander si le Sahel n\u2019est pas progressivement en train d\u2019entrer dans une nouvelle p\u00e9riode plus humide.<\/p>\n<figure id=\"attachment_29994\" aria-describedby=\"caption-attachment-29994\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29994\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/sahel-arbres\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?fit=500%2C333&amp;ssl=1\" data-orig-size=\"500,333\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Sahel arbres\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?fit=500%2C333&amp;ssl=1\" class=\"wp-image-29994 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?resize=500%2C333&#038;ssl=1\" alt=\"\" width=\"500\" height=\"333\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-arbres-.jpg?resize=480%2C320&amp;ssl=1 480w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-29994\" class=\"wp-caption-text\"><em>Credit https:\/\/www.stopblablacam.com\/societe\/1906-4333-operation-sahel-vert-32-000-hectares-de-terre-reboises-a-l-extreme-nord<\/em><\/figcaption><\/figure>\n<h2>Une r\u00e9gion qui retrouve de l\u2019eau<\/h2>\n<p>Le Sahel forme une immense bande semi-aride situ\u00e9e entre le Sahara au nord et les savanes plus humides au sud. Il s\u2019\u00e9tend approximativement du S\u00e9n\u00e9gal jusqu\u2019\u00e0 l\u2019\u00c9thiopie.<\/p>\n<p>Son climat d\u00e9pend fortement de la mousson d\u2019Afrique de l\u2019Ouest. Chaque \u00e9t\u00e9, entre juin et septembre, des masses d\u2019air humide venant notamment du golfe de Guin\u00e9e remontent vers le nord.<\/p>\n<p>La distance parcourue par cette mousson est fondamentale.<\/p>\n<p>Lorsqu\u2019elle remonte suffisamment vers le Sahara, les pr\u00e9cipitations peuvent \u00eatre abondantes. Lorsqu\u2019elle reste plus au sud, les r\u00e9gions sah\u00e9liennes subissent de graves d\u00e9ficits pluviom\u00e9triques.<\/p>\n<p>C\u2019est pr\u00e9cis\u00e9ment ce qui s\u2019est produit pendant une grande partie des ann\u00e9es 1970 et 1980.<\/p>\n<p>Le Sahel connut alors plusieurs s\u00e9cheresses catastrophiques, associ\u00e9es \u00e0 des famines qui auraient provoqu\u00e9 la mort de centaines de milliers de personnes.<\/p>\n<p>Depuis les ann\u00e9es 1990, la tendance semble n\u00e9anmoins s\u2019\u00eatre progressivement invers\u00e9e.<\/p>\n<figure id=\"attachment_29989\" aria-describedby=\"caption-attachment-29989\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29989\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/sahel-vert\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?fit=1536%2C1024&amp;ssl=1\" data-orig-size=\"1536,1024\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Sahel vert\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?fit=800%2C533&amp;ssl=1\" class=\"wp-image-29989 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=800%2C533&#038;ssl=1\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=800%2C533&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=768%2C512&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=1226%2C817&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=928%2C619&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?resize=480%2C320&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert.jpg?w=1536&amp;ssl=1 1536w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-29989\" class=\"wp-caption-text\">Illustration<\/figcaption><\/figure>\n<h2>Les nappes phr\u00e9atiques remontent parfois de plusieurs m\u00e8tres<\/h2>\n<p>L\u2019un des signes les plus spectaculaires de cette transformation est invisible depuis la surface : il se trouve sous terre.<\/p>\n<p>Dans plusieurs r\u00e9gions du Niger, les scientifiques ont constat\u00e9 que le niveau moyen des nappes phr\u00e9atiques avait augment\u00e9 d\u2019environ <strong>4 m\u00e8tres<\/strong>.<\/p>\n<p>Cette remont\u00e9e correspondrait localement \u00e0 une augmentation d\u2019environ <strong>15 % des r\u00e9serves aquif\u00e8res<\/strong>.<\/p>\n<p>Les observations r\u00e9alis\u00e9es sur le terrain sont d\u00e9sormais confort\u00e9es par les satellites de la mission GRACE de la NASA.<\/p>\n<p>Ces satellites d\u00e9tectent de minuscules variations de la gravit\u00e9 terrestre provoqu\u00e9es notamment par les variations de masse d\u2019eau.<\/p>\n<p>Depuis environ deux d\u00e9cennies, ils mettent en \u00e9vidence une augmentation du stockage terrestre de l\u2019eau dans une grande partie du Sahel.<\/p>\n<p>Richard Taylor, hydrog\u00e9ologue \u00e0 l\u2019University College London, estime que ce ph\u00e9nom\u00e8ne appara\u00eet \u00e0 une \u00e9chelle remarquable : des signes d\u2019augmentation des r\u00e9serves terrestres en eau sont observ\u00e9s depuis l\u2019\u00c9thiopie jusqu\u2019au S\u00e9n\u00e9gal.<\/p>\n<figure id=\"attachment_30004\" aria-describedby=\"caption-attachment-30004\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"30004\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/inondations-nigeria\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?fit=720%2C480&amp;ssl=1\" data-orig-size=\"720,480\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Inondations Nigeria\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?fit=720%2C480&amp;ssl=1\" class=\"wp-image-30004 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?resize=720%2C480&#038;ssl=1\" alt=\"\" width=\"720\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Inondations-Nigeria-.webp?resize=480%2C320&amp;ssl=1 480w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption id=\"caption-attachment-30004\" class=\"wp-caption-text\"><em>Credit Des gens se d\u00e9placent \u00e0 travers Maiduguri inond\u00e9e, au Nig\u00e9ria, en septembre 2024. &#8211; \u00a9 Audu Marte \/ AFP<\/em><\/figcaption><\/figure>\n<h2>Les pluies ne sont pas seulement plus abondantes : elles deviennent plus violentes<\/h2>\n<p>Le retour de l\u2019eau au Sahel pr\u00e9sente cependant un paradoxe.<\/p>\n<p>La r\u00e9gion ne conna\u00eet pas simplement davantage de petites pluies r\u00e9guli\u00e8res.<\/p>\n<p>Une part croissante des pr\u00e9cipitations arrive sous forme d\u2019<strong>orages extr\u00eamement intenses<\/strong>.<\/p>\n<p>Ces gigantesques ensembles orageux, appel\u00e9s syst\u00e8mes convectifs de m\u00e9so-\u00e9chelle, peuvent parcourir plusieurs centaines de kilom\u00e8tres.<\/p>\n<p>Ils figurent parmi les syst\u00e8mes orageux les plus puissants de la plan\u00e8te.<\/p>\n<p>Une analyse cit\u00e9e par <em>Live Science<\/em> estime que la fr\u00e9quence des temp\u00eates les plus extr\u00eames aurait \u00e9t\u00e9 multipli\u00e9e par environ trois depuis les ann\u00e9es 1980.<\/p>\n<p>Cela provoque un changement radical du risque climatique.<\/p>\n<p>Autrefois, la catastrophe typique du Sahel \u00e9tait la s\u00e9cheresse.<\/p>\n<p>Aujourd\u2019hui, certaines r\u00e9gions doivent \u00e9galement affronter des inondations gigantesques.<\/p>\n<p>Lors de la saison de mousson 2024, de tr\u00e8s importantes pr\u00e9cipitations ont notamment touch\u00e9 le Niger. La capitale Niamey a \u00e9t\u00e9 inond\u00e9e et plus de 150 000 habitations rurales en briques de terre auraient \u00e9t\u00e9 d\u00e9truites.<\/p>\n<figure id=\"attachment_29996\" aria-describedby=\"caption-attachment-29996\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29996\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/eau-mali\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?fit=1920%2C1279&amp;ssl=1\" data-orig-size=\"1920,1279\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Eau mali\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?fit=800%2C533&amp;ssl=1\" class=\"wp-image-29996 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=800%2C533&#038;ssl=1\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=800%2C533&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=768%2C512&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=1536%2C1023&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=1226%2C817&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=928%2C618&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?resize=480%2C320&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Eau-mali.jpg?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-29996\" class=\"wp-caption-text\"><em>Credit Parc r\u00e9gional du W Wild Africa Conservation (WAC)<\/em><\/figcaption><\/figure>\n<h2>Pourquoi des pluies violentes peuvent-elles remplir les nappes ?<\/h2>\n<p>Cela semble contre-intuitif.<\/p>\n<p>Lorsqu\u2019une pluie tombe extr\u00eamement rapidement sur un sol sec et durci, une grande partie de l\u2019eau ne p\u00e9n\u00e8tre pas imm\u00e9diatement dans la terre.<\/p>\n<p>Elle ruisselle.<\/p>\n<p>Mais dans le Sahel, cette eau se dirige souvent vers des d\u00e9pressions naturelles, des mares temporaires, des cours d\u2019eau ou d\u2019anciens lits de rivi\u00e8res appel\u00e9s <strong>wadis<\/strong>.<\/p>\n<p>L\u2019eau peut alors s\u2019y concentrer et s\u2019infiltrer progressivement vers les nappes souterraines.<\/p>\n<p>Ainsi, l\u2019intensit\u00e9 d\u2019un orage peut parfois \u00eatre plus importante pour la recharge d&rsquo;un aquif\u00e8re que la quantit\u00e9 totale de pluie tomb\u00e9e pendant l\u2019ann\u00e9e.<\/p>\n<p>C\u2019est l\u2019un des m\u00e9canismes qui expliquerait la hausse rapide du niveau de certaines nappes phr\u00e9atiques.<\/p>\n<figure id=\"attachment_30008\" aria-describedby=\"caption-attachment-30008\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"30008\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/muraille-verte-afrique-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?fit=1280%2C960&amp;ssl=1\" data-orig-size=\"1280,960\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"muraille verte Afrique\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?fit=800%2C600&amp;ssl=1\" class=\"wp-image-30008 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=800%2C600&#038;ssl=1\" alt=\"\" width=\"800\" height=\"600\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=800%2C600&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=1226%2C920&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=928%2C696&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?resize=480%2C360&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/muraille-verte-Afrique-.jpg?w=1280&amp;ssl=1 1280w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-30008\" class=\"wp-caption-text\"><em>Credit La Grande Muraille verte. (c) A.Spani<\/em><\/figcaption><\/figure>\n<h2>Un \u00e9tonnant paradoxe h\u00e9rit\u00e9 des grandes s\u00e9cheresses<\/h2>\n<p>Les s\u00e9cheresses du XXe si\u00e8cle ont \u00e9galement transform\u00e9 les sols.<\/p>\n<p>Apr\u00e8s des ann\u00e9es de s\u00e9cheresse et de chaleur intense, certaines surfaces se sont compact\u00e9es et ont d\u00e9velopp\u00e9 des cro\u00fbtes presque imperm\u00e9ables.<\/p>\n<p>R\u00e9sultat : lorsqu\u2019il pleut \u00e9norm\u00e9ment, davantage d\u2019eau ruisselle vers les d\u00e9pressions et les cours d\u2019eau.<\/p>\n<p>Dans le Sahel central, certaines recherches estiment que ce ph\u00e9nom\u00e8ne aurait augment\u00e9 le ruissellement d\u2019environ <strong>50 %<\/strong> au cours des derni\u00e8res d\u00e9cennies.<\/p>\n<p>Les s\u00e9cheresses du pass\u00e9 contribueraient donc paradoxalement \u00e0 amplifier certaines inondations actuelles\u2026 tout en facilitant indirectement la concentration de l\u2019eau vers les zones o\u00f9 elle peut alimenter les aquif\u00e8res.<\/p>\n<figure id=\"attachment_29990\" aria-describedby=\"caption-attachment-29990\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29990\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/sahel-vert-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?fit=1536%2C1024&amp;ssl=1\" data-orig-size=\"1536,1024\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Sahel vert 1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?fit=800%2C533&amp;ssl=1\" class=\"wp-image-29990 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=800%2C533&#038;ssl=1\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=800%2C533&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=768%2C512&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=1226%2C817&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=928%2C619&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?resize=480%2C320&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-vert-1.jpg?w=1536&amp;ssl=1 1536w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-29990\" class=\"wp-caption-text\">Illustration<\/figcaption><\/figure>\n<h2>Le surprenant r\u00f4le de la diminution du charbon<\/h2>\n<p>Mais pourquoi la mousson africaine est-elle redevenue plus active ?<\/p>\n<p>L\u2019une des explications les plus int\u00e9ressantes concerne la pollution atmosph\u00e9rique des pays industrialis\u00e9s au XXe si\u00e8cle.<\/p>\n<p>Pendant plusieurs d\u00e9cennies, la combustion massive du charbon en Europe et en Am\u00e9rique du Nord lib\u00e9rait d\u2019importantes quantit\u00e9s de dioxyde de soufre.<\/p>\n<p>Ces \u00e9missions produisaient des <strong>a\u00e9rosols sulfat\u00e9s<\/strong> dans l\u2019atmosph\u00e8re.<\/p>\n<p>Contrairement aux gaz \u00e0 effet de serre, ces particules ont g\u00e9n\u00e9ralement un effet refroidissant : elles r\u00e9fl\u00e9chissent une partie du rayonnement solaire.<\/p>\n<p>Au cours du XXe si\u00e8cle, ces a\u00e9rosols ont donc contribu\u00e9 \u00e0 refroidir l\u2019Atlantique Nord.<\/p>\n<p>Or la temp\u00e9rature de l\u2019oc\u00e9an Atlantique joue un r\u00f4le majeur dans la position de la mousson ouest-africaine.<\/p>\n<p>Lorsque l\u2019Atlantique Nord \u00e9tait relativement froid, la mousson avait davantage de difficult\u00e9s \u00e0 remonter vers le nord.<\/p>\n<p>Cela aurait fortement contribu\u00e9 aux s\u00e9cheresses dramatiques du Sahel de la seconde moiti\u00e9 du XXe si\u00e8cle.<\/p>\n<p>Puis les choses ont chang\u00e9.<\/p>\n<p>\u00c0 partir des ann\u00e9es 1980, les r\u00e9glementations environnementales europ\u00e9ennes et nord-am\u00e9ricaines ont consid\u00e9rablement r\u00e9duit les \u00e9missions de dioxyde de soufre.<\/p>\n<p>Le \u00ab voile \u00bb d\u2019a\u00e9rosols refroidissants s\u2019est donc progressivement dissip\u00e9.<\/p>\n<p>Combin\u00e9 au r\u00e9chauffement climatique mondial, ce ph\u00e9nom\u00e8ne a provoqu\u00e9 un r\u00e9chauffement important de l\u2019Atlantique Nord.<\/p>\n<p>La mousson africaine a alors progressivement pu remonter plus au nord.<\/p>\n<p>Le GIEC consid\u00e8re avec un niveau de confiance \u00e9lev\u00e9 que ce r\u00e9chauffement de l\u2019Atlantique Nord, r\u00e9sultant \u00e0 la fois du r\u00e9chauffement global et de la diminution des a\u00e9rosols sulfat\u00e9s, a jou\u00e9 un r\u00f4le important dans le retour des pr\u00e9cipitations au Sahel.<\/p>\n<p>Autrement dit, <strong>la diminution de la pollution issue notamment du charbon en Europe et en Am\u00e9rique du Nord aurait indirectement contribu\u00e9 au retour des pluies dans le Sahel.<\/strong><\/p>\n<figure id=\"attachment_24099\" aria-describedby=\"caption-attachment-24099\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"24099\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-niveaux-de-co2-sont-maintenant-comparables-a-ce-quils-etaient-il-y-a-4-millions-dannees-selon-la-noaa\/ville-pollution\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?fit=1024%2C415&amp;ssl=1\" data-orig-size=\"1024,415\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"ville pollution\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;(Revolu7ion93\/E+\/Getty Images)&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?fit=800%2C324&amp;ssl=1\" class=\"wp-image-24099 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?resize=800%2C324&#038;ssl=1\" alt=\"\" width=\"800\" height=\"324\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?resize=800%2C324&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?resize=300%2C122&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?resize=768%2C311&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/06\/ville-pollution.jpg?w=1024&amp;ssl=1 1024w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-24099\" class=\"wp-caption-text\">(Revolu7ion93\/E+\/Getty Images)<\/figcaption><\/figure>\n<h2>Le lac Tchad revient lui aussi<\/h2>\n<p>Le ph\u00e9nom\u00e8ne est particuli\u00e8rement visible dans le bassin du lac Tchad.<\/p>\n<p>Le lac \u00e9tait devenu l\u2019une des images embl\u00e9matiques de la d\u00e9sertification africaine.<\/p>\n<p>Sa superficie avait consid\u00e9rablement diminu\u00e9 pendant les grandes s\u00e9cheresses du XXe si\u00e8cle.<\/p>\n<p>Mais contrairement \u00e0 l\u2019image souvent pr\u00e9sent\u00e9e d\u2019un lac condamn\u00e9 \u00e0 dispara\u00eetre inexorablement, les derni\u00e8res observations montrent une situation beaucoup plus complexe.<\/p>\n<p>Les apports d\u2019eau augmentent \u00e0 nouveau.<\/p>\n<p>En 2024, des chercheurs de l\u2019Universit\u00e9 de N&rsquo;Djamena ont estim\u00e9 que le lac avait atteint temporairement une superficie sup\u00e9rieure \u00e0 <strong>23 000 km\u00b2<\/strong>, soit pr\u00e8s de dix fois l\u2019\u00e9tendue observ\u00e9e lors de certaines p\u00e9riodes tr\u00e8s s\u00e8ches du milieu des ann\u00e9es 1980.<\/p>\n<p>Une partie de cette extension est difficilement visible sur certaines images satellites, car de larges zones sont couvertes d\u2019une v\u00e9g\u00e9tation aquatique dense.<\/p>\n<p>Le retour de l\u2019eau dans le lac contribue \u00e9galement \u00e0 recharger les aquif\u00e8res situ\u00e9s sous celui-ci.<\/p>\n<figure id=\"attachment_29998\" aria-describedby=\"caption-attachment-29998\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29998\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/lac-tchad\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?fit=1280%2C960&amp;ssl=1\" data-orig-size=\"1280,960\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Lac tchad\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?fit=800%2C600&amp;ssl=1\" class=\"wp-image-29998 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=800%2C600&#038;ssl=1\" alt=\"\" width=\"800\" height=\"600\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=800%2C600&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=1226%2C920&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=928%2C696&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?resize=480%2C360&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Lac-tchad.jpg?w=1280&amp;ssl=1 1280w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-29998\" class=\"wp-caption-text\"><em>Credit Vue de Ngorerom, village de p\u00eacheurs sur les rives du lac Tchad. \u00a9 Carol Valade \/ RFI<\/em><\/figcaption><\/figure>\n<h2>200 millions d\u2019arbres auraient repouss\u00e9 au Niger<\/h2>\n<p>Le retour des pr\u00e9cipitations n\u2019est cependant pas seul responsable du reverdissement.<\/p>\n<p>Les pratiques agricoles \u00e9voluent \u00e9galement.<\/p>\n<p>Dans le sud du Niger, les agriculteurs ont notamment favoris\u00e9 la r\u00e9g\u00e9n\u00e9ration naturelle des arbres au milieu de leurs cultures.<\/p>\n<p>Au lieu d\u2019arracher syst\u00e9matiquement les jeunes pousses, certaines sont conserv\u00e9es et entretenues.<\/p>\n<p>Selon les estimations cit\u00e9es par les chercheurs, environ <strong>200 millions d\u2019arbres<\/strong> auraient ainsi repouss\u00e9 sur d\u2019anciennes terres pratiquement d\u00e9pourvues d\u2019arbres.<\/p>\n<p>Ces arbres peuvent am\u00e9liorer la fertilit\u00e9 du sol, limiter son \u00e9rosion, fournir de l\u2019ombre aux cultures et participer \u00e0 la restauration des \u00e9cosyst\u00e8mes.<\/p>\n<p>Des techniques traditionnelles de r\u00e9cup\u00e9ration des eaux de pluie sont \u00e9galement r\u00e9utilis\u00e9es.<\/p>\n<p>Dans plusieurs r\u00e9gions, de petites excavations ou diguettes permettent de ralentir le ruissellement et d\u2019augmenter l\u2019infiltration de l\u2019eau dans le sol.<\/p>\n<p>La Grande Muraille verte africaine pourrait \u00e9galement jouer un r\u00f4le local dans ce processus de restauration des terres.<\/p>\n<figure id=\"attachment_29992\" aria-describedby=\"caption-attachment-29992\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"29992\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/sahel-reboisement\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?fit=600%2C449&amp;ssl=1\" data-orig-size=\"600,449\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Sahel.-reboisement\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?fit=600%2C449&amp;ssl=1\" class=\"wp-image-29992 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?resize=600%2C449&#038;ssl=1\" alt=\"\" width=\"600\" height=\"449\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel.-reboisement.jpg?resize=480%2C359&amp;ssl=1 480w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-29992\" class=\"wp-caption-text\"><em>Credit https:\/\/www.fillesstesprit.org\/operation-sahel-vert\/ Cameroun <\/em><\/figcaption><\/figure>\n<h2>La faune commence \u00e9galement \u00e0 b\u00e9n\u00e9ficier de cette transformation<\/h2>\n<p>Le retour de l\u2019eau et de la v\u00e9g\u00e9tation commence \u00e0 modifier certains \u00e9cosyst\u00e8mes.<\/p>\n<p>Dans la r\u00e9serve naturelle de Ouadi Rim\u00e9-Ouadi Achim, au Tchad, les syst\u00e8mes de wadis se r\u00e9activent.<\/p>\n<p>Des populations d\u2019oryx algazelles, autrefois d\u00e9clar\u00e9es \u00e9teintes \u00e0 l\u2019\u00e9tat sauvage, ont \u00e9t\u00e9 r\u00e9introduites et comptent d\u00e9sormais plusieurs centaines d\u2019individus.<\/p>\n<p>D\u2019autres animaux, notamment des porcs-\u00e9pics, renards ou oryct\u00e9ropes, profitent \u00e9galement du retour d\u2019habitats plus favorables.<\/p>\n<p>Dans certaines r\u00e9gions du Niger, les girafes d\u2019Afrique de l\u2019Ouest retrouvent elles aussi une v\u00e9g\u00e9tation plus abondante.<\/p>\n<figure id=\"attachment_30000\" aria-describedby=\"caption-attachment-30000\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"30000\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/arbres-niger\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?fit=1200%2C900&amp;ssl=1\" data-orig-size=\"1200,900\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Arbres niger\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?fit=800%2C600&amp;ssl=1\" class=\"wp-image-30000 size-large\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=800%2C600&#038;ssl=1\" alt=\"\" width=\"800\" height=\"600\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=800%2C600&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=928%2C696&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?resize=480%2C360&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Arbres-niger.jpg?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-30000\" class=\"wp-caption-text\"><em>Credit Un fermier nig\u00e9rien \u00e0 l&rsquo;ombre d&rsquo;un des arbres de la Grande muraille verte, le 13 novembre 2021 \u00e0 Simiri, au Niger AFP &#8211; BOUREIMA HAMA<\/em><\/figcaption><\/figure>\n<h2>Une renaissance agricole possible ?<\/h2>\n<p>Pour les populations humaines, l\u2019enjeu est \u00e9videmment consid\u00e9rable.<\/p>\n<p>Gr\u00e2ce \u00e0 la remont\u00e9e des nappes phr\u00e9atiques, certaines exploitations peuvent \u00e0 nouveau irriguer leurs champs.<\/p>\n<p>Autour du lac Tchad et dans diff\u00e9rentes r\u00e9gions du Niger, du Tchad et du Cameroun, de petits syst\u00e8mes d\u2019irrigation sont r\u00e9install\u00e9s autour des oasis et des r\u00e9serves souterraines.<\/p>\n<p>Certaines familles peuvent d\u00e9sormais exploiter plusieurs fois plus de terres qu\u2019auparavant.<\/p>\n<p>Si cette disponibilit\u00e9 en eau persiste, certains chercheurs \u00e9voquent m\u00eame la possibilit\u00e9 d\u2019une <strong>renaissance agricole du Sahel<\/strong> au cours du XXIe si\u00e8cle.<\/p>\n<p>Mais cette perspective doit \u00eatre prise avec beaucoup de prudence.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"7743\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/la-grande-muraille-verte-du-sahara-pour-reverdir-le-sahara\/trace-grande-muraille-verte-sahara\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?fit=416%2C257&amp;ssl=1\" data-orig-size=\"416,257\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"trace-grande-muraille-verte-sahara\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?fit=416%2C257&amp;ssl=1\" class=\"aligncenter wp-image-7743\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?resize=500%2C309&#038;ssl=1\" alt=\"\" width=\"500\" height=\"309\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?w=416&amp;ssl=1 416w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?resize=300%2C185&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>Non, cela ne signifie pas que le r\u00e9chauffement climatique est \u00ab b\u00e9n\u00e9fique \u00bb<\/h2>\n<p>Le retour des pluies au Sahel pourrait facilement \u00eatre interpr\u00e9t\u00e9 de mani\u00e8re trop simpliste.<\/p>\n<p>Le r\u00e9chauffement climatique peut effectivement renforcer le cycle hydrologique et favoriser davantage de pr\u00e9cipitations dans certaines r\u00e9gions.<\/p>\n<p>Mais davantage de pluie ne signifie pas n\u00e9cessairement un climat plus favorable.<\/p>\n<p>Une atmosph\u00e8re plus chaude peut contenir davantage de vapeur d\u2019eau.<\/p>\n<p>Lorsque les conditions atmosph\u00e9riques d\u00e9clenchent des pr\u00e9cipitations, les quantit\u00e9s d\u2019eau susceptibles de tomber deviennent donc plus importantes.<\/p>\n<p>Dans le Sahel, cela peut produire une alternance entre p\u00e9riodes s\u00e8ches prolong\u00e9es et pr\u00e9cipitations torrentielles.<\/p>\n<p>Les nappes phr\u00e9atiques peuvent se remplir pendant que les villages situ\u00e9s \u00e0 la surface sont d\u00e9vast\u00e9s par les inondations.<\/p>\n<p>Le Sahel passe ainsi progressivement d\u2019un r\u00e9gime principalement domin\u00e9 par la s\u00e9cheresse \u00e0 un r\u00e9gime climatique plus complexe dans lequel <strong>s\u00e9cheresses et pluies extr\u00eames peuvent coexister<\/strong>.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"512\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/au-maroc-le-desert-reverdit-peu-a-peu\/sahel-reverdissement\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&amp;ssl=1\" data-orig-size=\"370,284\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"sahel-reverdissement\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&amp;ssl=1\" class=\"aligncenter wp-image-512\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?resize=500%2C384&#038;ssl=1\" alt=\"sahel reverdissement\" width=\"500\" height=\"384\"\/><\/p>\n<h2>Le Sahara va-t-il reverdir ?<\/h2>\n<p>C\u2019est probablement la question la plus fascinante.<\/p>\n<p>Le Sahara n\u2019est pas condamn\u00e9 \u00e0 \u00eatre \u00e9ternellement d\u00e9sertique.<\/p>\n<p>Au cours des derniers centaines de milliers d\u2019ann\u00e9es, il a connu plusieurs \u00ab p\u00e9riodes vertes \u00bb, lorsque les modifications de l\u2019orbite terrestre renfor\u00e7aient fortement la mousson africaine.<\/p>\n<p>La plus r\u00e9cente, appel\u00e9e <strong>P\u00e9riode humide africaine<\/strong>, s\u2019est termin\u00e9e il y a environ 5 000 ans.<\/p>\n<p>\u00c0 cette \u00e9poque, de vastes zones aujourd\u2019hui d\u00e9sertiques abritaient des savanes, des lacs, des rivi\u00e8res et une importante faune.<\/p>\n<p>La situation actuelle est toutefois diff\u00e9rente.<\/p>\n<p>Les chercheurs ne pr\u00e9disent pas la transformation prochaine de tout le Sahara en savane.<\/p>\n<p>En revanche, les marges m\u00e9ridionales du d\u00e9sert pourraient conna\u00eetre une augmentation durable des pr\u00e9cipitations et de la v\u00e9g\u00e9tation.<\/p>\n<p>Le v\u00e9ritable ph\u00e9nom\u00e8ne observ\u00e9 aujourd\u2019hui concerne donc principalement <strong>le Sahel<\/strong>, et non l\u2019ensemble du Sahara.<\/p>\n<figure id=\"attachment_30006\" aria-describedby=\"caption-attachment-30006\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"30006\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/sahel-reverdit\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?fit=750%2C500&amp;ssl=1\" data-orig-size=\"750,500\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Sahel reverdit\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?fit=750%2C500&amp;ssl=1\" class=\"wp-image-30006 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?resize=750%2C500&#038;ssl=1\" alt=\"\" width=\"750\" height=\"500\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?w=750&amp;ssl=1 750w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?resize=80%2C53&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?resize=480%2C320&amp;ssl=1 480w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-30006\" class=\"wp-caption-text\"><em>Credit La Grande Muraille Verte vue du ciel. Photographie de Alex Baramgoto Jr pour Tchad Infos.<\/em><\/figcaption><\/figure>\n<h2>Vers une nouvelle \u00e8re humide du Sahel ?<\/h2>\n<p>Le ph\u00e9nom\u00e8ne semble d\u00e9sormais suffisamment important pour que certains scientifiques \u00e9voquent l&rsquo;hypoth\u00e8se d\u2019une nouvelle phase humide.<\/p>\n<p>Les simulations climatiques sugg\u00e8rent en effet que les pr\u00e9cipitations pourraient continuer \u00e0 augmenter dans certaines parties du Sahel au XXIe si\u00e8cle.<\/p>\n<p>Mais cette nouvelle p\u00e9riode humide ne ressemblerait probablement pas aux climats relativement stables du pass\u00e9.<\/p>\n<p>Elle pourrait \u00eatre caract\u00e9ris\u00e9e par davantage de chaleur, des moussons plus intenses et surtout des pr\u00e9cipitations beaucoup plus irr\u00e9guli\u00e8res.<\/p>\n<p>Le Sahel du XXIe si\u00e8cle pourrait ainsi devenir simultan\u00e9ment <strong>plus vert, plus humide et plus dangereux<\/strong>.<\/p>\n<p>Il s\u2019agit l\u00e0 d\u2019un exemple particuli\u00e8rement spectaculaire de la complexit\u00e9 du changement climatique : une r\u00e9gion autrefois consid\u00e9r\u00e9e comme condamn\u00e9e \u00e0 une d\u00e9sertification inexorable montre aujourd\u2019hui des signes importants de r\u00e9cup\u00e9ration hydrologique.<\/p>\n<p>Des rivi\u00e8res revivent.<\/p>\n<p>Des nappes souterraines remontent.<\/p>\n<p>Le lac Tchad regagne du terrain.<\/p>\n<p>Des centaines de millions d\u2019arbres poussent \u00e0 nouveau.<\/p>\n<p>Et la mousson africaine revient plus profond\u00e9ment vers les portes du Sahara.<\/p>\n<p>Le Sahel n\u2019est donc peut-\u00eatre pas simplement en train de reverdir.<\/p>\n<p>Il pourrait \u00eatre en train d\u2019entrer dans <strong>une nouvelle phase climatique de son histoire<\/strong>.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"30011\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit-et-retrouve-de-leau-apres-plusieurs-decennies-de-secheresse\/pourquoi-sahel-reverdit\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?fit=1448%2C1086&amp;ssl=1\" data-orig-size=\"1448,1086\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"Pourquoi sahel reverdit\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?fit=800%2C600&amp;ssl=1\" class=\"aligncenter wp-image-30011 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=1448%2C1086&#038;ssl=1\" alt=\"\" width=\"1448\" height=\"1086\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?w=1448&amp;ssl=1 1448w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=800%2C600&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=80%2C60&amp;ssl=1 80w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=1226%2C920&amp;ssl=1 1226w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=928%2C696&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Pourquoi-sahel-reverdit-.jpg?resize=480%2C360&amp;ssl=1 480w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Adaptation Terra Projects&nbsp;<\/p>\n<h3><em>Sources principales<\/em><\/h3>\n<p><em>Live Science \/ Yale Environment 360, Fred Pearce, 9 ao\u00fbt 2026.<\/em><\/p>\n<p><em>Travaux de Richard Taylor, University College London, sur la recharge des nappes phr\u00e9atiques du Sahel.<\/em><\/p>\n<p><em>GIEC \u2014 Sixi\u00e8me rapport d\u2019\u00e9valuation sur les changements climatiques et l\u2019\u00e9volution des pr\u00e9cipitations en Afrique de l\u2019Ouest.<\/em><\/p>\n<p><em>NASA \u2014 mission GRACE, observations des variations du stockage terrestre de l\u2019eau.<\/em><\/p>\n<p><em>Travaux de chercheurs de l\u2019Universit\u00e9 de N&rsquo;Djamena sur l\u2019\u00e9volution r\u00e9cente du lac Tchad.<\/em><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"29986\">(48)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Le Sahel reverdit : vers le retour d\u2019une \u00e8re humide aux portes du Sahara ? Pendant des d\u00e9cennies, le Sahel&#8230;<\/p>\n","protected":false},"author":1,"featured_media":30006,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[20,27],"tags":[196,289,333,683,3052,648,637,1795,99],"class_list":["post-29986","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climat","category-ecologie","tag-afrique","tag-arbres","tag-eau","tag-mousson","tag-muraille-verte","tag-pluies","tag-sahel","tag-verdure","tag-vert","wpcat-20-id","wpcat-27-id"],"jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/p631RN-7NE","jetpack-related-posts":[{"id":2628,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-sahara-reverdit\/","url_meta":{"origin":29986,"position":0},"title":"Et si le Sahara reverdissait ?","author":"Admin","date":"27 d\u00e9cembre 2004","format":false,"excerpt":"Le Sahel reverdit\u00a0! Ce n'est pas une incantation, mais une tendance bel et bien observ\u00e9e par des chercheurs qui ont d\u00e9pouill\u00e9 quinze ans de photographies satellites de la r\u00e9gion. Ces g\u00e9ographes europ\u00e9ens affirment que les terres cultivables commencent \u00e0 reprendre progressivement du terrain. Une bonne nouvelle\u00a0! D\u00e9cid\u00e9ment le changement climatique\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2004\/12\/Vegetation-algerie.jpg?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2004\/12\/Vegetation-algerie.jpg?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2004\/12\/Vegetation-algerie.jpg?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2004\/12\/Vegetation-algerie.jpg?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2004\/12\/Vegetation-algerie.jpg?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":908,"url":"https:\/\/www.laterredufutur.com\/accueil\/lafrique-reverdit-iv\/","url_meta":{"origin":29986,"position":1},"title":"L&rsquo;Afrique reverdit IV","author":"Admin","date":"27 mai 2012","format":false,"excerpt":"Depuis 2004, o\u00f9 nous avions vu que sur la Terre du Futur, des indices nous d\u00e9montraient un reverdissement de l'Afrique, voici qu'au-del\u00e0 des catastrophes naturelles attribu\u00e9es au r\u00e9chauffement climatique se profile une inexorable fatalit\u00e9 faite de d\u00e9sertification, de s\u00e9cheresse, de pauvret\u00e9 et de mort. Mais il se pourrait que ce\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"pluie afrique","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":12201,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-deserts-africains-reverdissent\/","url_meta":{"origin":29986,"position":2},"title":"Les d\u00e9serts africains reverdissent","author":"Admin","date":"12 mai 2016","format":false,"excerpt":"Une nouvelle \u00e9tude de l'Arizona State University a confirm\u00e9 que les d\u00e9serts Africains reverdissaient. Comme cela a \u00e9t\u00e9\u00a0rapport\u00e9 en septembre 2015 par\u00a0Breitbart, contrairement \u00e0 tout ce que les alarmistes nous ont dit, les d\u00e9serts de l' Afrique connaissent un\u00a0\u00abreverdissement\u00bb de fa\u00e7on constante depuis les s\u00e9cheresses des ann\u00e9es 1970 et 1980\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":514,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-sahara-reverdit-iii\/","url_meta":{"origin":29986,"position":3},"title":"Le Sahara reverdit III","author":"Admin","date":"6 septembre 2011","format":false,"excerpt":"Depuis 2004, nous constations un reverdissement du sahel \u00e0 contrario de tous les dires m\u00e9diatiques. Ainsi certains scientifiques nous apportaient \u00e0 l'\u00e9poque cette recherche : \"Le Sahel reverdit\u00a0! Ce n'est pas une incantation, mais une tendance bel et bien observ\u00e9e par des chercheurs qui ont d\u00e9pouill\u00e9 quinze ans de photographies\u2026","rel":"","context":"Dans &quot;Ecologie&quot;","block_context":{"text":"Ecologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/ecologie\/"},"img":{"alt_text":"sahel reverdissement","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":16170,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit\/","url_meta":{"origin":29986,"position":4},"title":"Le Sahel reverdit","author":"Admin","date":"10 janvier 2018","format":false,"excerpt":"Selon une \u00e9tude publi\u00e9e en juin 2015 dans la revue Nature Climate Change [1] le Sahel reverdit gr\u00e2ce \u00e0 une pluviosit\u00e9 en augmentation depuis les ann\u00e9es 80. La pluviom\u00e9trie \u00e0 l\u2019origine de ce verdissement Il y a un consensus sur le fait que le Sahel gagne en couverture v\u00e9g\u00e9tale par\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":7742,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-grande-muraille-verte-du-sahara-pour-reverdir-le-sahara\/","url_meta":{"origin":29986,"position":5},"title":"La Grande muraille verte du Sahara pour reverdir le Sahara","author":"Admin","date":"6 ao\u00fbt 2015","format":false,"excerpt":"A l'heure o\u00f9 l'on parle de la plan\u00e8te Mars, voire de la terraformer, il serait bon de se poser les vraies questions pour notre propre plan\u00e8te. De Dakar \u00e0 Djibouti, une muraille verte pourquoi faire ? 11 pays africains s\u2019engagent pour freiner l\u2019avanc\u00e9e du d\u00e9sert et de la d\u00e9sertification au\u2026","rel":"","context":"Dans &quot;Solutions&quot;","block_context":{"text":"Solutions","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/solutions\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?fit=416%2C257&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/08\/Sahel-reverdit.png?fit=750%2C500&ssl=1","_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/29986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=29986"}],"version-history":[{"count":15,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/29986\/revisions"}],"predecessor-version":[{"id":30012,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/29986\/revisions\/30012"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/30006"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=29986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=29986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=29986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}