【5A版】英语全球变暖PPT.ppt

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

2、arradiationthroughtheatmosphereintotheground,andwarmingthegroundafterthelengthofradiationbeingreleasedintheatmospherebyabsorbingcarbondioxideandothersubstances,therebycreatingtheeffectofatmosphericwarming.GreenhouseeffectHumanactivities-emissionBurningnaturalgas,coal,andoilElectricitygenerationDe

3、forestationManyfactoriesproducelong-lastingindustrialgasesPopulationgrowth3.What’retheeffectsofglobalwarmingEffectsonHumansEffectsonWildlifeGlobalwarmingisadangertoahuman'shealth.Itsaffectonclimatecanadverselyaffecthumans.Plagueshavebeenattributedtoglobalwarming.Anincreaseintemperaturecanresultin

4、alongerlifecyclefordiseases.Globalwarmingcanaffectourfutureabilitytoobtainfood.Asclimateschange,plantsandanimalswillchange,leadingtoachangeintheeatingpatternsofhumans.EffectsonHumansEffectsonWildlifePolarBearsRequirepackicetoliveMighteventuallygoextinctinthewildSeaturtlesBreedonthesameislandsast

5、heirbirthCouldgoextinctonsomeislandsasbeachesarefloodedOtherspeciesmaygoextinctasrainfallpatternschangethroughouttheworldSowemusttakeeffectivemeasurestosolvethisproblemWhatshouldwedo?4.Whatshoulddo1.Individualefforts2.NationaleffortsFirst,weshouldusemorecleanenergyandlesscoalandoil.Second,weshou

6、ldgotoworkonfootorbybusinsteadofdrivingacarifpossible.Third,weshouldplantmoretrees,becauseplantscanturnCO2intooxygen.Moreimportantly,weshouldformthehabitofsavingenergyinourdailylife.Whatshouldgovernmentsdo?First,governmentscansupportresearch.Forexample,theyshouldencouragecompaniestodevelopvehicle

7、sthatcauselesspollution.Theyshouldalsosupportalternativesourcesofelectricityfromwindandwaterratherthanfromoilandcoal.Secondly,theyshouldmakelawsthatlimittheamountofgreenhousegasesthatcompaniescanemit.Privatecompaniessh