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asisseenfromthetwographs,itisclearthatwiththerapidgrowthofu.s.populationfrom1800to1990,thenumberofitswildlifespeciesnolongerexistingsoaredduringthesameperiod.naturally,wecandrawtheconclusionthatthesharpdeclineofwildlifespeciesresultedfromthepopulationgrowth.
tworeasonsmayaountforthisphenomenon.tobeginwith,asthepopulationgrows,peopleconsumemuchmorenaturalresources,whichoftenleadstoexcessivehunting.second,withtheincreaseofhumanactivities,modernpeopletakeupmoreandmorespace.whichhasagreatimpactonotherspecies.finally,theproblemofpollutionbeesmoreandmoreseriouswiththedevelopmentofmodernindustry.moreandmoreanimalshavetoadaptthemselvestothedecayingenvironmentormovetoatotallydifferentplace,butnotallofthemarefortunateenoughtosurvivethechanges.
solvingthisproblemcallsfor,aboveall,thegovernment’seffortstocontrolpopulationgrowth,todecreaseindustrialpollutionandtoenhancethelawstoforbidwildlifehunting.moreover,moncitizensshouldbeawareofthisecologicalcrisisandtakeontheresponsibilityofwildlifeprotection.inaword,onlywhenthegovernmentandthemonpeoplemakejointeffortscanwehopetofindasatisfactorysolutiontothisproblem.