你知道什么叫“温室效应”吗?它对地球又有什么样的影响呢?Agreenhouseisabuildingmadeofglasswhichisusedforkeepingoolplantswarmwhentheoutsidetemperatureislow.Inasimilarwaythereareseveralgasesintheatmospherewhichtraptheheatproducedbythesunandpreventitfromescaping.Thesegasesareknownas“greenhousegases”,andthewayinwhichtheytrapheatintheatmosphereiscalled“thegreenhouseeffect”.Thisisnotsimpleairpollution.Mostofthemaingreenhousegasesexistnaturallyinsmallamountsino...
