68Global Warming

GlobalWarmingGlobalwarmingistheobservedcenturyscaleriseintheaveragetemperureofEarth'sclimatesystem.WhatcausesGlobalWarming?•Withthedevelopmentofeconomy,moreandmoregreenhousegasesarebeingdischargedintotheair.CO2makesupabout70%ofthegreenhousegases,whichisconsideredtobeoneofthegreatestcausesofglobalwarming.Whataretheeffectsofglobalwarming?•First,theglobalsurfacetemperaturehasrisenabout3.5centigradeduringthepast100yearsandtherateoftemperatureriseisspeedingup.Theeffectsofglobalwarming,includingglaciersmelt,sealevelriseandcrisisofhumanliving,isfrombadtoworse.Whataretheeffectsofglobalwarming?•Second,withtheglobaltemperatureincreasing,theglaciersofnorthandsouthpolesaremeltinggradually.•Whataretheeffectsofglobalwarming?•Third,theanimals,whichliveonthesouthandnorthpoles,isfacingthethreatofextinctioninfuture.Forexample,thenumberofpolarbearisdecreasingyearbyyear.Whataretheeffectsofglobalwarming?•Asthesealevelrises,alargenumberofislandsarefacingthethreatofbeingdevoured.Infact,inordertosurvive,thedevouredcountriesmustlookforotherlandstolive.Amoreterriblethingiscomingstealthy.Intheprocessofsearchingforotherlands,awar,whichfightsforlivingspaceislikelytobreakout.Whataretheeffectsofglobalwarming?•Theworsteffectisthatglobalwarmingisinfluencingthesurvivalofhumanbeing.Theearthisacompleteecologicalsystem.Aswementionedbefore,themeltingglaciers，therisingsealevelandthepotentialwar,willaggravatethewreckofecologicalsystem.Duetothewickedenvironment,thehumancannotliveontheearthanylonger.Whatcanwedo?•1.usemorecleanenergyandlesscoalandoil.•2.weshouldgotoworkonfootorbybusinsteadofdrivingacarifpossible.•3.weshouldplantmoretrees,becauseplantscanturnCO2intooxygen•4.Moreimportantly,weshouldformthehabitofsavingenergyinourdailylife.