2021年英语四级听力美文第93篇:Hotter or Colder ?思维导图

笔灵AI论文写作三步搞定，GO>>

当前位置:树图

思维导图模板

资格考试

英语

2021年英语四级听力美文第93篇:Hotter or Colder ?思维导图

免费下载

免费使用文件

一生孤注掷温柔

浏览量：2

2023-03-16 20:58:26

已被使用0次

查看详情

2021年英语四级听力美文第93篇:HotterorColder?

树图思维导图提供 2021年英语四级听力美文第93篇:Hotter or Colder ? 在线思维导图免费制作，点击“编辑”按钮，可对 2021年英语四级听力美文第93篇: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：911ce14c7a918e25c5feb5ed7d21caec

大学教育四六级复习辅导四级四级辅导听力

举报/反馈

思维导图大纲

2021年英语四级听力美文第93篇:Hotter or Colder ?思维导图模板大纲

点击查看》》2021年英语四级听力美文汇总

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.