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1、GlobleWarmingSpeaker：2012011678DefinitionlWhatisglobalwarming?GlobalwarmingistheobservedandprojectedincreasesintheaveragetemperatureofEarth'satmosphereandoceans.lPresentsituationTheEarth'saveragetemperatureroseabout0.6°Celsius(1.1°Fahrenheit)inthe20thcenturylPredictionAccordingt
2、odifferentassumptionaboutthefuturebehaviourofmankind,aprojectionofcurrenttrendsasrepresentedbyanumberofdifferentscenarios givestemperatureincreasesofabout3°to5° C(5° to9° Fahrenheit)bytheyear2100orsoonafterwards.CauseslCarbondioxideemissionsfromfossilfuelburningpowerplantsEveryd
3、ay,moreelectricgadgetsfloodthemarket,andwithoutwidespreadalternativeenergysources,wearehighlydependentonburningcoalforourpersonalandcommercialelectricalsupply.CarbondioxideemissionsfromburninggasolinefortransportationWithourpopulationgrowingatanalarmingrate,thedemandformorecarsa
4、ndconsumergoodsmeansthatweareincreasingtheuseoffossilfuelsfortransportationandmanufacturing.Ourconsumptionisoutpacingourdiscoveriesofwaystomitigatetheeffects.lMethaneemissionsfromanimals ,agriculturesuchasricepaddies,andfromArcticseabedsMethaneisanotherextremelypotentgreenhouseg
5、as,rankingrightbehindCO2.Whenorganicmatterisbrokendownbybacteriaunderoxygen-starvedconditionsasinricepaddies,methaneisproduced.lDeforestation ,especiallytropicalforestsforwood,pulp,andfarmlandTheuseofforestsforfuelisonecauseofdeforestation. Forestsremoveandstorecarbondioxidefrom
6、theatmosphere,andthisdeforestationreleaseslargeamountsofcarbon,aswellasreducingtheamountofcarboncaptureontheplanet.lIncreaseinusageofchemicalfertilizersoncroplands Inthelasthalfofthe20thcentury,theuseof chemicalfertilzers hasrisendramatically. Thehighrateofapplicationofnitrogen-
7、richfertilizershaseffectsontheheatstorageofcroplandandtherun-offofexcessfertilizerscreates 'dead-zones' inouroceans.GlobalWarmingEffectslinsealevels worldwideScientistspredictanincreaseinsealevelsworldwideduetothemeltingoftwomassiveicesheetsinAntarcticaandGreenland,especiallyont
8、he EastcoastoftheUS. However,manynationsaroundt
