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绿色环保英语作文Theareaofdesertintheworldisgrowingeveryyear.Manypartsoftheworldwhichoncehadlargepopulationsandproducedplentyofcropshavebeedeserts.DunhuanginChinadeepintheheartoftheGebiDesertwasonceagreatcity.Cattleareonecauseoftheproblem.Ingoodyearsfamersincreasethenumbersoftheircattle.Thenoneyeartherainsfailtoe.Thefarmersdonotwanttokillanyoftheircattlesothecattleeatailthegrassandanythingthatgrowsonpoorerland.Ifthiscontinuesforseveralyearsthegrassnevergrowsagainandthelandbeesadesert.Onesuggestedanswerisforfarmerstolimitthenumbersoftheircattle.Anotherproblemisthatgoodsoilisgraduallylost.Whentreesarecutdownthereisnothingtoholdthesoilinplaceonthehillside.Sowhenifrainsthesoiliswasheddownthehillsandintotherivers.Strongwindscanalsoblowawaythevaluablesoilthatliesonthetopofthefields.世界上沙漠的面积每年都在扩大,许多地区曾经人口众多,五谷丰登,而今却成了沙漠...。