@omundoafundo: 🌏 Uma linha de árvores atravessando o norte da China de oeste a leste, plantada para impedir que o deserto engolisse a terra de plantio. O Programa de Florestas de Proteção do Três-Norte, apelidado de Grande Muralha Verde, começou em 1978 e está previsto para terminar por volta de 2050. As estimativas de extensão variam entre cerca de 4.500 e 4.800 km, e a faixa chega a quase 1.400 km de largura em alguns trechos. Nos anos 1980, o deserto de Gobi avançava a cerca de 10 mil km² por ano. 🪲 A pressa cobrou o preço. Para ganhar altura rápido em solo pobre, o programa concentrou o plantio em poucas espécies de crescimento acelerado — em Ningxia, cerca de 70% das mudas eram choupo ou salgueiro. Uma plantação com uma espécie só é uma plantação com um único ponto de falha, e em 2000 esse ponto foi atingido: uma infestação de besouro broqueador do gênero Anoplophora varreu os choupos da província e, segundo os registros, cerca de 1 bilhão de árvores foram perdidas, apagando duas décadas de trabalho. 💧 O segundo problema é mais lento e mais grave. Choupo é espécie sedenta e boa parte do cinturão está em região árida e semiárida: as raízes passaram a puxar do lençol freático, e a água subterrânea começou a baixar. Um estudo de 2026 sobre duas décadas do programa mostra que o aumento do verde na superfície e a queda da água armazenada no subsolo andam juntos em grande parte da região. Em áreas do norte, faixas inteiras de floresta de proteção secaram e morreram em pé. 💬 Nem tudo é fracasso: a cobertura florestal da China subiu de cerca de 10% em 1949 para perto de 25% em 2024, e o Gobi passou a encolher mais de 2 mil km² por ano. Mas estudos de sobrevivência apontam que só cerca de 1 em cada 10 plantações em areia continuava viva 40 anos depois. Você acha que valeu a pena? Siga O Mundo a Fundo para acompanhar mais casos reais como este. #muralhaverde #china #deserto #gobi #desertificacao #reflorestamento #ningxia #meioambiente #engenharia #OMundoaFundo

O Mundo a Fundo | Fatos Reais
O Mundo a Fundo | Fatos Reais
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Tuesday 01 September 2026 23:55:01 GMT
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