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1、GlobalWarmingThereisoneofthemostsensitiveglobalclimateissuesforyears,whichisglobalwarming.Ingeneral,weknowthattheoriginofglobalwarmingistheemissionofcarbondioxide.Itwasverifiedthattherelationshipbetweencarbondioxideandtemperature:whenthereismorecarbondioxidethetemperaturegetswarmer.Thistopicshouldbe
2、discussedundercurrentsituationtoadvocatepeopleconcerningwiththissevereenvironmentalissue.Meanwhile,peopleshouldconsiderhowtoreducetheemissionofcarbondioxideandtakesomeactionstostopglobalwarming.Whatisglobalwarming?Whatcausedglobalwarming?Whatarethenegativeeffectscausedbyglobalwarming?Whatcanwedotosa
3、vetheearth?Arethereanypositiveeffects?Inthenextparagraphs,Iwillexplainthesequestionsindetails.Whatisglobalwarming?GlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation(Brown22).Accordingtothe2007FourthAssessmentReportbyth
4、eIntergovernmentalPanelonClimateChange,globalsurfacetemperatureincreased0.74 ± 0.18 °C(1.33 ± 0.32 °F)duringthe20thcentury(Keppler).Innearly100years,theaverageglobaltemperaturegoesthroughfourfluctuations:cold,warm,coldagain,andwarmagain.After1980s,thetemperaturewasascendingobviously.Whatcausedglobal
5、warming?Itiscausedbyseveralfactors.First,populationexplosionisoneofthemainfactorsofglobalwarming;italsothreatensthebalancebetweenmanandnature.Second,atmosphericpollutionisbeingontherise,andithasalreadybecomeaninternationalmajorproblem.Itisalsothebasicproblemofglobalwarming.Third,marineecologyandenvi
6、ronmenttookaturnfortheworse.Thatmayleadtothedamageoffreshwaterresouces.Forth,erosion,salinization,anddesertificationoflandmaketheecologicalenvironmentdeteriorated,andfloodandsandstormmayhappenmorefrequently.Fifth,theforestresourcesaresharplydecreasedbynaturalchangesandhumanactions.Sixth,acidraincand
7、estroytheforests,acidatelakes,andendangeranimals.Seventh,waterpollutiondestroyedthebalancebetweenthedemandandsupplyoffreshwater.Last,toxicchemicalwasteshavethreatsontheecologicalenvironmentontheearth’
