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1、GlobalWarmingThereisoneofthemostsensitiveglobalclimateissuesforyears,whichisglobalwarming.Ingeneral,weknowthattheoriginofglobalwarmingistheemissionofcarbondioxide.Itwasverifiedthattherelationshipbetweencarbondioxideandtemperature:whenthereismorecarbondioxidethetemperaturegetswarmer.T
2、histopicshouldbediscussedundercurrentsituationtoadvocatepeopleconcerningwiththissevereenvironmentalissue.Meanwhile,peopleshouldconsiderhowtoreducetheemissionofcarbondioxideandtakesomeactionstostopglobalwarming.Whatisglobalwarming?Whatcausedglobalwarming?Whatarethenegativeeffectscause
3、dbyglobalwarming?Whatcanwedotosavetheearth?Arethereanypositiveeffects?Inthenextparagraphs,Iwillexplainthesequestionsindetails.Whatisglobalwarming?GlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation(Brown
4、22).Accordingtothe2007FourthAssessmentReportbytheIntergovernmentalPanelonClimateChange,globalsurfacetemperatureincreased0.74 ± 0.18 °C(1.33 ± 0.32 °F)duringthe20thcentury(Keppler).Innearly100years,theaverageglobaltemperaturegoesthroughfourfluctuations:cold,warm,coldagain,andwarmagain
5、.After1980s,thetemperaturewasascendingobviously.Whatcausedglobalwarming?Itiscausedbyseveralfactors.First,populationexplosionisoneofthemainfactorsofglobalwarming;italsothreatensthebalancebetweenmanandnature.Second,atmosphericpollutionisbeingontherise,andithasalreadybecomeaninternation
6、almajorproblem.Itisalsothebasicproblemofglobalwarming.Third,marineecologyandenvironmenttookaturnfortheworse.Thatmayleadtothedamageoffreshwaterresouces.Forth,erosion,salinization,anddesertificationoflandmaketheecologicalenvironmentdeteriorated,andfloodandsandstormmayhappenmorefrequent
7、ly.Fifth,theforestresourcesaresharplydecreasedbynaturalchangesandhumanactions.Sixth,acidraincandestroytheforests,acidatelakes,andendangeranimals.Seventh,waterpollutiondestroyedthebalancebetweenthedemandandsupplyoffreshwater.Last,toxicchemicalwasteshavethreatsontheecologicalenvironmen
8、tontheearth’
