2021年英语四级美文赏析：Hotter or Colder ?思维导图

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2021年英语四级美文赏析：Hotter or Colder ?思维导图

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2023-03-17 00:12:34

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2021年英语四级美文赏析：HotterorColder?

树图思维导图提供 2021年英语四级美文赏析：Hotter or Colder ? 在线思维导图免费制作，点击“编辑”按钮，可对 2021年英语四级美文赏析：Hotter or Colder ? 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：d210d10f8cd1718602bb9a72e86b2d3d

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2021年英语四级美文赏析：Hotter or Colder ?思维导图模板大纲

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HotterorColder?

Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyaroundlargecitieswithfactoriesand/orheavyautomobiletraffic.Today,weknowthatalthoughthesearetheareaswiththeworstairpollution,theproblemisliterallyworldwide.Onseveraloccasionsoverthepastdecade,aheavycloudofairpollutionhascoveredtheentireeasternhalfoftheUnitedStatesandledtohealthwarningseveninruralareasawayfromanymajorconcentrationofmanufacturingandautomobiletraffic.

Infact,theclimateoftheentireearthmaybeaffectedbyairpollution.Somescientistsfeelthattheincreasingconcentrationofcarbondioxideintheairresultingfromtheburningoffossilfuels(coalandoil)iscreatinga“greenhouseeffect”—holdinginheatreflectedfromtheearthandraisingtheworld’saveragetemperature.

Ifthisviewiscorrectandtheworld’stemperatureisraisedonlyafewdegrees,muchofthepolaricecapwillmeltandcitiessuchasNewYork,Boston,Miami,andNewOrleanswillbeunderwater.Anotherview,lesswidelyheld,isthatincreasingparticulatematterintheatmosphereisblockingsunlightandloweringtheearth’stemperature—aresultthatwouldbeequallydisastrous.Adropofjustafewdegreescouldcreatesomethingclosetonewiceageandwouldmakeagriculturedifficultorimpossibleinmanyofourtopfarmingareas.

Atpresentwedonotknowforsurethateitheroftheseconditionswillhappen(thoughonerecentgovernmentreportpreparedbyexpertsinthefieldconcludedthatthegreenhouseeffectisverylikely).Perhaps,ifweareverylucky,thetwotendencieswilloffseteachotherandtheworld’stemperaturewillstayaboutthesameasitisnow.