{"id":4409,"date":"2025-12-16T14:04:29","date_gmt":"2025-12-16T17:04:29","guid":{"rendered":"https:\/\/overticeportal.com.br\/?p=4409"},"modified":"2025-12-16T14:04:33","modified_gmt":"2025-12-16T17:04:33","slug":"38-da-floresta-amazonica-pode-sumir-ate-o-final-do-seculo-diz-estudo","status":"publish","type":"post","link":"https:\/\/portalam9.com.br\/?p=4409","title":{"rendered":"38% da Floresta Amaz\u00f4nica pode sumir at\u00e9 o final do s\u00e9culo, diz estudo"},"content":{"rendered":"\n

Tempo de leitura: 3 minutos <\/em><\/p>\n\n\n\n

Conhecida como \u201co cora\u00e7\u00e3o do mundo<\/em>\u201d,\u00a0a Floresta Amaz\u00f4nica\u00a0tem uma biodiversidade extremamente variada, fundamental na regula\u00e7\u00e3o clim\u00e1tica global, \u201cbombeando<\/em>\u201d umidade para a atmosfera e absorvendo enormes quantidades de carbono, o que ajuda a manter os padr\u00f5es de chuva.<\/p>\n\n\n\n

No entanto, um novo estudo mostra que as batidas do cora\u00e7\u00e3o amaz\u00f4nico est\u00e3o em risco. Pesquisadores alem\u00e3es apontam que mudan\u00e7as clim\u00e1ticas e\u00a0altera\u00e7\u00f5es no uso da terra\u00a0podem causar a perda de at\u00e9 38% da floresta at\u00e9 o final do s\u00e9culo. Os resultados preocupantes foram publicados em 8 de dezembro na\u00a0revista cient\u00edfica PNAS.<\/p>\n\n\n\n

\n

\u201cNossa an\u00e1lise mostra que at\u00e9 38% da \u00e1rea florestal existente em 1950 poder\u00e1 ser perdida at\u00e9 o final do s\u00e9culo, sendo 25% atribu\u00edveis a mudan\u00e7as no uso da terra e 13% ao aumento das temperaturas. Isso nos levaria al\u00e9m do limite de 20% a 25%, que estudos anteriores alertaram ser o ponto de inflex\u00e3o para a Floresta Amaz\u00f4nica\u201d, aponta a autora principal do estudo, Selma Bultan, em comunicado.<\/p>\n<\/blockquote>\n\n\n\n

Com 5,5 milh\u00f5es de quil\u00f4metros quadrados de extens\u00e3o, a Amaz\u00f4nia \u00e9 considerada a maior floresta tropical do mundo<\/strong>. Al\u00e9m do papel essencial clim\u00e1tico e na biodiversidade, a regi\u00e3o abriga comunidades ind\u00edgenas<\/strong> importantes e ainda \u00e9 essencial para frear o aquecimento global<\/strong>. Entre os ecossistemas terrestres, a floresta abriga um d\u00e9cimo dos estoques de carbono mundial.<\/p>\n\n\n\n

A sobreviv\u00eancia amaz\u00f4nica segue um ciclo simples, mas importante: ao absorver a umidade oce\u00e2nica, a floresta a leva para seu interior. Com evapora\u00e7\u00e3o constante, o ambiente florestal transforma tudo em precipita\u00e7\u00e3o, devolvendo a umidade em forma de chuva, o que mant\u00e9m a Amaz\u00f4nia viva.<\/p>\n\n\n\n

Mas os pesquisadores descobriram que a substitui\u00e7\u00e3o das \u00e1reas florestais por terras ar\u00e1veis e expans\u00e3o da pecu\u00e1ria, combinadas com a intensifica\u00e7\u00e3o das ondas de secas e calor provocadas pelo aquecimento global aumentam os riscos futuramente.<\/p>\n\n\n\n

A principal preocupa\u00e7\u00e3o est\u00e1 ligada a uma poss\u00edvel transi\u00e7\u00e3o entre a densa cobertura florestal para vegeta\u00e7\u00f5es semelhantes \u00e0 savana, com paisagens abertas, repleta de capins e \u00e1rvores mais espa\u00e7adas. Em grande escala, o cen\u00e1rio poderia se tornar irrevers\u00edvel e a Amaz\u00f4nia nunca mais se recuperaria<\/strong>.<\/p>\n\n\n\n

Dados mostram urg\u00eancia em proteger a Floresta Amaz\u00f4nica<\/h2>\n\n\n\n

Para chegar aos resultados, foram utilizados dados para analisar o desmatamento da bacia amaz\u00f4nica entre 1950 a 2014. Assim, foi poss\u00edvel desenhar o cen\u00e1rio clim\u00e1tico em que a Amaz\u00f4nia perderia 38% de sua cobertura florestal.<\/p>\n\n\n\n

Tamb\u00e9m foi identificado que o risco da perda abrupta se elevaria caso o aquecimento global aumentasse a temperatura global em 2,3\u00baC. \u201cCom base nas pol\u00edticas atuais e nos compromissos concretos com a a\u00e7\u00e3o clim\u00e1tica, estamos caminhando para um aquecimento global de pelo menos 2,5\u00b0C<\/em>\u201d, alerta a coautora Julia Pongratz, professora de Geografia F\u00edsica e Sistemas de Uso da Terra da Ludwig-Maximilians-Universit\u00e4t, na Alemanha.<\/p>\n\n\n\n

Para os cientistas, as descobertas ressaltam a necessidade de ampliar a\u00a0prote\u00e7\u00e3o de florestas\u00a0tropicais, al\u00e9m da antecipa\u00e7\u00e3o dos compromissos clim\u00e1ticos para frear o aquecimento global o mais r\u00e1pido poss\u00edvel.<\/p>\n\n\n\n

Fonte: Metr\u00f3poles \/ <\/strong>Foto: Ignacio Palacios\/Getty Images
<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Tempo de leitura: 3 minutos Conhecida como \u201co cora\u00e7\u00e3o do mundo\u201d,\u00a0a Floresta Amaz\u00f4nica\u00a0tem uma biodiversidade<\/p>\n","protected":false},"author":3,"featured_media":4410,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-4409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades-2"],"yoast_head":"\n38% da Floresta Amaz\u00f4nica pode sumir at\u00e9 o final do s\u00e9culo, diz estudo - Portal Amazonas 9<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/portalam9.com.br\/?p=4409\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"38% da Floresta Amaz\u00f4nica pode sumir at\u00e9 o final do s\u00e9culo, diz estudo - 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