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Europa deve se adaptar a secas e enchentes, alertam pesquisadores

Para os especialistas, as cidades precisam se preparar para ondas de calor consideravelmente piores, a intensificaAi??A?o de secas e mais enchentes de rios

Roma ai??i?? As cidadesAi??europeiasAi??podem enfrentar ondas de calor consideravelmente piores, a intensificaAi??A?o de secas e mais enchentes de rios na segunda metade do sAi??culo se as temperaturas globais continuarem a aumentar ai??i?? algo para o qual precisam comeAi??ar a se preparar agora, alertaram pesquisadores nesta quarta-feira.

As temperaturas globais jA? estA?o um grau Celsius acima dos nAi??veis prAi??-industriais, e devem chegar a 3 graus ou mais neste sAi??culo a menos que as emissAi??es sejam contidas rapidamente, de acordo com a OrganizaAi??A?o das NaAi??Ai??es Unidas (ONU).

Se esta elevaAi??A?o ocorrer, cidades do centro da Europa testemunharA?o o maior aumento de temperaturas durante ondas de calor ai??i?? variando entre 2 e 14 graus Celsius, dependendo do aumento das temperaturas globais -, disseram pesquisadores da Universidade de Newcastle, no Reino Unido.

Mas os pesquisadores, que estudaram o impacto de uma elevaAi??A?o das temperaturas mundiais situada entre 2,6 e 4,8 graus Celsius, disseram que cidades do sul europeu terA?o os maiores aumentos no nA?mero de dias de ondas de calor.

As secas tambAi??m vA?o se tornar mais longas e mais A?ridas e, no pior cenA?rio, chegarA?o ao norte da Europa, disseram.

ai???JA? estamos comeAi??ando a ver um aumento das ondas de calor e das secas e enchentes, entA?o as cidades precisam comeAi??ar a pensar em se adaptar agora, ou atAi?? ontemai???, afirmou Selma Guerreiro, principal autora de um estudo publicado no periA?dico cientAi??fico Environmental Research Letters.

No ano passado, grande parte do sul europeu teve secas prolongadas, que provocaram incA?ndios florestais generalizados e dizimaram lavouras. Roma desligou suas fontes pA?blicas e por pouco nA?o teve que racionar o suprimento de A?gua residencial.

O Reino Unido e a Alemanha sofreram enchentes graves nos A?ltimos anos, e Paris foi forAi??ada a retirar 1.500 pessoas quando o Sena transbordou no mA?s passado.

ai???Existem muitos eventos climA?ticos extremos nos atingindoai???, disse o coautor Richard Dawson.

A seca que ameaAi??a atualmente os suprimentos de A?gua da sul-africana Cidade do Cabo Ai?? um exemplo contundente de como as cidades precisam se adaptar muito antes de uma seca ou enchente ocorrer.

Quando uma seca chega e a A?gua comeAi??a a acabar, pode ser tarde demais para construir outro reservatA?rio ou usina de dessalinizaAi??A?o, disse Dawson, e ondas de calor e enchentes criam problemas semelhantes.

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