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1、GlobalWarmingThereisoneofthemostsensitiveglobalclimateissuesforyears,whichisglobalwarming.Ingeneral,weknowthattheoriginofglobalwarmingistheemissionofcarbondioxide.Itwasverifiedthattherelationshipbetweencarbondioxideandtemperature:whenthereismorecarbondioxidethetemp
2、eraturegetswarmer.Thistopicshouldbediscussedundercurrentsituationtoadvocatepeopleconcerningwiththissevereenvironmentalissue.Meanwhile,peopleshouldconsiderhowtoreducetheemissionofcarbondioxideandtakesomeactionstostopglobalwarming.Whatisglobalwarming?Whatcausedglobal
3、warming?Whatarethenegativeeffectscausedbyglobalwarming?Whatcanwedotosavetheearth?Arethereanypositiveeffects?Inthenextparagraphs,Iwillexplainthesequestionsindetails.Whatisglobalwarming?GlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandocean
4、ssincethemid-20thcenturyanditsprojectedcontinuation(Brown22).Accordingtothe2007FourthAssessmentReportbytheIntergovernmentalPanelonClimateChange,globalsurfacetemperatureincreased0.74 ± 0.18 °C(1.33 ± 0.32 °F)duringthe20thcentury(Keppler).Innearly100years,theaverageg
5、lobaltemperaturegoesthroughfourfluctuations:cold,warm,coldagain,andwarmagain.After1980s,thetemperaturewasascendingobviously.Whatcausedglobalwarming?Itiscausedbyseveralfactors.First,populationexplosionisoneofthemainfactorsofglobalwarming;italsothreatensthebalancebet
6、weenmanandnature.Second,atmosphericpollutionisbeingontherise,andithasalreadybecomeaninternationalmajorproblem.Itisalsothebasicproblemofglobalwarming.Third,marineecologyandenvironmenttookaturnfortheworse.Thatmayleadtothedamageoffreshwaterresouces.Forth,erosion,salin
7、ization,anddesertificationoflandmaketheecologicalenvironmentdeteriorated,andfloodandsandstormmayhappenmorefrequently.Fifth,theforestresourcesaresharplydecreasedbynaturalchangesandhumanactions.Sixth,acidraincandestroytheforests,acidatelakes,andendangeranimals.Sevent
8、h,waterpollutiondestroyedthebalancebetweenthedemandandsupplyoffreshwater.Last,toxicchemicalwasteshavethreatsontheecologicalenvironmentontheearth’
