Theyounggreenconsumerguide 　　Thisbooksaysthatourworldisindanger.Itisvitalthatwedosomethingtosavetheearth.Firstofall,whatarethethreatstoourenvironment? 　　Thegreenhouseeffect 　　Thewritersaskusto"imaginetheearthinsideakindofgreenhousewiththeatmospherearounditactingliketheglass,lettingsunlightinwhilekeepingmuchofthewarmthfromgettingout.Theatmosphereisessentialtoalllivingthings.Withoutit,theearthwouldbeascoldandlifelessasthesurfaceofthemoon." 　　"Thetroubleisthatouratmosphereischangingbecausewearepollutingitwithchemicals-intheformofgases-anditiskeepingintoomuchheat! 　　Thesegases,mainlycarbondioxide(CO2),areproducedbyburningfuelssuchaspetrol.TheGreenhouseEffectmaycausetheleveloftheseatoriseanddrowncitiesandevenwholecountries. 　　Damagetotheozonelayer 　　Thewriterstellusthat"ozoneisagaswhichoccurs20-50kmabovetheground.Itformsanessentialprotectivelayeraroundtheearth.Withoutit,thesunwouldburnusup." 　　WearemakingholesintheozonelayermainlybyusingchemicalscalledCFCs.Weusetheseinfridgesandspraycans,andtomakeplasticitemssuchasfastfoodboxes. 　　Destructionoftherainforests 　　TheburningandcuttingdownoftreesismakingtheGreenhouseEffectworsebecausetreestakeinCO2.Italsocauseserosionofthesoilandflooding,aswellasdestroyingthepeopleandanimalswhomakethefreststheirhome. 　　Badhabits 　　Manyofourhabitscausepollution,especiallyourhabitofusingthingsonceandthenthrowingthemaway.Thiscreatesmassivemountainsofrubbish.Wedonotknowwhattodowiththerubbishanditpollutesourlandandsea.Forexample,sevenbilliondrinkcansarethrownawayinBritaineachyear.Thatisenoughtoreachfromtheearthtothemoon. 　　Howcanwesavetheearth? 　　Thebook'sideaisthatweshouldbecomegreenconsumers.Thatis,weshouldonlybuyandusethingsthatdonotdamagetheenvironment.Andweshouldbuyonlyfromcompainesthatdonotdamagetheenvironmenteither. 　　打得我手都酸了,就可怜一下吧.这篇课文我们刚刚学完,还不算太长,给你打了那么多,一定要用心看啊!