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1、GlobalWarmingThereisoneofthemostsensitiveglobalclimateissuesforyears,whichisglobalwarming.Ingeneral,weknowthattheoriginofglobalwarmingistheemissionofcarbondioxide.Itwasverifiedthattherelationshipbetweencarbondioxideandtemperature:whenthereismorecarbondioxidethetemperaturegetswarmer.Thistopicsh
2、ouldbediscussedundercurrentsituationtoadvocatepeopleconcerningwiththissevereenvironmentalissue.Meanwhile,peopleshouldconsiderhowtoreducetheemissionofcarbondioxideandtakesomeactionstostopglobalwarming.Whatisglobalwarming?Whatcausedglobalwarming?Whatarethenegativeeffectscausedbyglobalwarming?Wha
3、tcanwedotosavetheearth?Arethereanypositiveeffects?Inthenextparagraphs,Iwillexplainthesequestionsindetails.Whatisglobalwarming?GlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation(Brown22).Accordingtothe2007FourthAs
4、sessmentReportbytheIntergovernmentalPanelonClimateChange,globalsurfacetemperatureincreased0.74 ± 0.18 °C(1.33 ± 0.32 °F)duringthe20thcentury(Keppler).Innearly100years,theaverageglobaltemperaturegoesthroughfourfluctuations:cold,warm,coldagain,andwarmagain.After1980s,thetemperaturewasascendingob
5、viously.Whatcausedglobalwarming?Itiscausedbyseveralfactors.First,populationexplosionisoneofthemainfactorsofglobalwarming;italsothreatensthebalancebetweenmanandnature.Second,atmosphericpollutionisbeingontherise,andithasalreadybecomeaninternationalmajorproblem.Itisalsothebasicproblemofglobalwarm
6、ing.Third,marineecologyandenvironmenttookaturnfortheworse.Thatmayleadtothedamageoffreshwaterresouces.Forth,erosion,salinization,anddesertificationoflandmaketheecologicalenvironmentdeteriorated,andfloodandsandstormmayhappenmorefrequently.Fifth,theforestresourcesaresharplydecreasedbynaturalchang
7、esandhumanactions.Sixth,acidraincandestroytheforests,acidatelakes,andendangeranimals.Seventh,waterpollutiondestroyedthebalancebetweenthedemandandsupplyoffreshwater.Last,toxicchemicalwasteshavethreatsontheecologicalenvironmentontheearth’
