GlobalWarmingThereisoneofthemostsensitiveglobalclimateissuesforyears,,:,?Whatcausedglobalwarming?Whatarethenegativeeffectscausedbyglobalwarming?Whatcanwedotosavetheearth?Arethereanypositiveeffects?Inthenextparagraphs,?GlobalwarmingistheincreaseintheaveragetemperatureofEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation(Brown22).Accordingtothe2007FourthAssessmentReportbytheIntergovernmentalPanelonClimateChange, ± °C( ± °F)duringthe20thcentury(Keppler).Innearly100years,theaverageglobaltemperaturegoesthroughfourfluctuations:cold,warm,coldagain,,?,populationexplosionisoneofthemainfactorsofglobalwarming;,atmosphericpollutionisbeingontherise,eaninternation
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