英语全球变暖.ppt

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1、GlobalWarming1.WhatisglobalwarmingGlobalwarming isthegradualriseintheEarth'stemperaturecausedbyhighlevelsofcarbondioxideandothergasesintheatmosphere.2.WhatcausedglobalwarmingNaturalcausesGreenhouseeffectHumanreasonsHumanactivities-emissionGreenhouseeffectTheso

2、-calledgreenhouseeffectisshortwavesolarradiationthroughtheatmosphereintotheground,andwarmingthegroundafterthelengthofradiationbeingreleasedintheatmospherebyabsorbingcarbondioxideandothersubstances,therebycreatingtheeffectofatmosphericwarming.GreenhouseeffectHu

3、manactivities-emissionBurningnaturalgas,coal,andoilElectricitygenerationDeforestationManyfactoriesproducelong-lastingindustrialgasesPopulationgrowth3.What’retheeffectsofglobalwarmingEffectsonHumansEffectsonWildlifeGlobalwarmingisadangertoahuman'shealth.Itsaffe

4、ctonclimatecanadverselyaffecthumans.Plagueshavebeenattributedtoglobalwarming.Anincreaseintemperaturecanresultinalongerlifecyclefordiseases.Globalwarmingcanaffectourfutureabilitytoobtainfood.Asclimateschange,plantsandanimalswillchange,leadingtoachangeintheeatin

5、gpatternsofhumans.EffectsonHumansEffectsonWildlifePolarBearsRequirepackicetoliveMighteventuallygoextinctinthewildSeaturtlesBreedonthesameislandsastheirbirthCouldgoextinctonsomeislandsasbeachesarefloodedOtherspeciesmaygoextinctasrainfallpatternschangethrougho

6、uttheworldSowemusttakeeffectivemeasurestosolvethisproblemWhatshouldwedo?4.Whatshoulddo1.Individualefforts2.NationaleffortsFirst,weshouldusemorecleanenergyandlesscoalandoil.Second,weshouldgotoworkonfootorbybusinsteadofdrivingacarifpossible.Third,weshouldplantmo

7、retrees,becauseplantscanturnCO2intooxygen.Moreimportantly,weshouldformthehabitofsavingenergyinourdailylife.Whatshouldgovernmentsdo?First,governmentscansupportresearch.Forexample,theyshouldencouragecompaniestodevelopvehiclesthatcauselesspollution.Theyshouldalso

8、supportalternativesourcesofelectricityfromwindandwaterratherthanfromoilandcoal.Secondly,theyshouldmakelawsthatlimittheamountofgreenhousegasesthatcompaniescanemit.Privatecompaniessh