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北師大版高中英語選修八unit22environmentalprotectiontheninthperiod教案-資料下載頁

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【導讀】tosumup,forexample,asaresult,however,inaddition,apartfrom,although,DealwithEx1.DealwithEx2.finishEx2.(why?Moreover,Furthermore,Whatismore,Inaddition,However,Nevertheless,Onthecontrary,ontheotherhand,Foronething,Incontrast,Asaresult,Forthisreason,Consequently,Tobeginwith,Inmyopinion,Apparently,

　　

【正文】 e into the atmosphere. Carbon dioxide in the atmosphere plays an important role in warming the earth by trapping the earth’s heat, in what’s called the greenhouse effect. The burning of fossil fuels has generally increased the amount of carbon dioxide in the atmosphere. The carbon dioxide then puts a layer on the greenhouse gasses. The greenhouse gasses let in rays from the sun but don’t let them out. As the concentration of greenhouse gases grows, more heat is trapped in the atmosphere and less escapes back into space. This increase in trapped heat changes the climate and alters weather patterns, which may hasten species extinction, influence the length of seasons, cause coastal flooding, and lead to more frequent and severe storms. Are governments doing enough to prevent global warming? Global warming can be controlled and sustained if we start now. There are an overwhelming number of issues that need to be addressed in order for us to help improve our environment. Global warming makes us feel very uneasy. To know that one day the polar icecaps could melt is a scary thought. If global warming continues to increase and raises the earth’s atmospheric temperatures, the melting of the polar ice caps could bee a reality. This would cause horrific devastation to many parts of the world. There would be floods, record heat waves, and destruction of aquatic life, scorched forests and disappearing species. If global warming continues to go unattended, it will slowly destroy the earth’s ecosystems and the life that depends on them.

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