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{"id":7135,"date":"2019-08-30T03:13:37","date_gmt":"2019-08-30T06:13:37","guid":{"rendered":"https:\/\/ybura.org\/site\/2019\/08\/30\/entenda-o-que-sao-os-permafrost-e-por-que-sao-uma-ameaca-a-saude-humana\/"},"modified":"2019-08-30T03:13:37","modified_gmt":"2019-08-30T06:13:37","slug":"entenda-o-que-sao-os-permafrost-e-por-que-sao-uma-ameaca-a-saude-humana","status":"publish","type":"post","link":"https:\/\/ybura.org\/site\/2019\/08\/30\/entenda-o-que-sao-os-permafrost-e-por-que-sao-uma-ameaca-a-saude-humana\/","title":{"rendered":"Entenda o que s\u00e3o os ‘permafrost’ e por que s\u00e3o uma amea\u00e7a \u00e0 sa\u00fade humana"},"content":{"rendered":"

Aquecimento global agrava o degelo de solos congelados e pode trazer de volta v\u00edrus e bact\u00e9rias que ficaram presos no passado. Gelo est\u00e1 derretendo no Mar de Chukchi, na costa do Alasca. Imagem feita pela embarca\u00e7\u00e3o enquanto atravessava o noroeste de \u00c1rtico, neste domingo (16)
\nDavid Goldman\/AP Photo
\nOs solos congelados “permafrost”, dos quais se espera que uma parte significativa venha \u00e0 superf\u00edcie at\u00e9 2100 por causa do aquecimento global, de acordo com um relat\u00f3rio da ONU, amea\u00e7am liberar v\u00edrus esquecidos e bilh\u00f5es de toneladas de gases de efeito estufa, com o risco de acelerar aquecimento global.
\nO que \u00e9 o permafrost?
\nO permafrost \u00e9 o solo que passa todo o ano congelado e que cobre 25% da superf\u00edcie terrestre do Hemisf\u00e9rio Norte, sobretudo na R\u00fassia, Canad\u00e1 e Alasca. Pode ser composto por pequenos fragmentos de gelo ou grandes massas, e sua espessura pode ir de poucos metros a centenas.
\nCont\u00eam quase 1,7 trilh\u00e3o de toneladas de carbono, ou seja, quase o dobro do di\u00f3xido de carbono (CO2) presente na atmosfera.
\nCom o aumento das temperaturas, o permafrost esquenta e come\u00e7a a derreter, liberando progressivamente os gases que estavam neutralizados. O fen\u00f4meno, segundo os cientistas, deve ganhar velocidade.
\nAcelera\u00e7\u00e3o do aquecimento global
\nO degelo do permafrost j\u00e1 amea\u00e7a o cumprimento das decis\u00f5es do Acordo de Paris, de limitar o aquecimento global a menos de +1,5 \u00baC em rela\u00e7\u00e3o \u00e0 era pr\u00e9-industrial, segundo um estudo publicado em setembro.
\nOs cientistas descrevem um c\u00edrculo vicioso: os gases emitidos pelo permafrost aceleram o aquecimento, que acelera o derretimento do permafrost.
\nAt\u00e9 2100, este \u00faltimo poderia, de acordo com o cen\u00e1rio menos catastr\u00f3fico, diminuir 30% e liberar at\u00e9 160 bilh\u00f5es de toneladas de gases do efeito estufa, alertou em 2015 a pesquisadora Susan Natali, do Woods Hole Research Center.
\nV\u00edrus esquecidos
\nAl\u00e9m dos efeitos clim\u00e1ticos, o degelo do permafrost, que abriga bact\u00e9rias e v\u00edrus \u00e0s vezes esquecidos, tamb\u00e9m representa uma amea\u00e7a para a sa\u00fade. Em 2016, um menino faleceu na Sib\u00e9ria ap\u00f3s ser contaminada por antraz, o que n\u00e3o acontecia h\u00e1 75 anos na regi\u00e3o.
\nPara os cientistas, a causa foi muito provavelmente o descongelamento de um cad\u00e1ver de rena que havia sido v\u00edtima de antraz v\u00e1rias d\u00e9cadas antes. Liberada, a bact\u00e9ria mortal, que se conserva no permafrost durante mais de um s\u00e9culo, infectou manadas de renas.
\nA amea\u00e7a n\u00e3o se limita ao antraz.
\nCientistas descobriram que nos \u00faltimos anos dois tipos de v\u00edrus gigantes, um de 30 mil anos de idade, estavam conservados no permafrost.
\nNas regi\u00f5es \u00e1rticas, que o degelo do permafrost tornou mais acess\u00edveis para a ind\u00fastria da minera\u00e7\u00e3o e do petr\u00f3leo, os cientistas preveem que alguns v\u00edrus poderiam despertar um dia caso o homem remova o solo em demasia.
\nPor fim, o degelo do permafrost tamb\u00e9m provoca danos materiais caros: desabamento de edif\u00edcios, deslizamentos de terras, estradas e pistas de aeroportos inst\u00e1veis.
\nDe acordo com um relat\u00f3rio de 2009 do Greenpeace, as empresas russas gastavam na ocasi\u00e3o at\u00e9 1,3 bilh\u00e3o de euros por ano para reparar as tubula\u00e7\u00f5es, edif\u00edcios e pontes deformadas na Sib\u00e9ria.<\/p>\n","protected":false},"excerpt":{"rendered":"

Aquecimento global agrava o degelo de solos congelados e pode trazer de volta v\u00edrus e bact\u00e9rias que ficaram presos no passado. Gelo est\u00e1 derretendo no Mar de Chukchi, na costa do Alasca. Imagem feita pela embarca\u00e7\u00e3o enquanto atravessava o noroeste de \u00c1rtico, neste domingo (16) David Goldman\/AP Photo Os solos congelados “permafrost”, dos quais se […]<\/p>\n","protected":false},"author":1,"featured_media":7136,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[64,63,62],"class_list":["post-7135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-g1","tag-noticias","tag-ong","tag-ybura"],"_links":{"self":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts\/7135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/comments?post=7135"}],"version-history":[{"count":0,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/posts\/7135\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/media\/7136"}],"wp:attachment":[{"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/media?parent=7135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/categories?post=7135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ybura.org\/site\/wp-json\/wp\/v2\/tags?post=7135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}