Thereasonsforthechangesarecomplex.Itisclearthatpollutionoftheairandwaterbyfactoriesisaffectingtheenvironment.Treesandothervegetationdie,andsosoiliseroded.themoretreesthatdie,thelesswaterisheldintheearth.theneedforwoodforfuelandbuildingsleadstofurtherdeforestation,whichcausesfurthersoilerosion.Localfarmersfinditmoreandmoredifficulttomakealiving.theyendupusinginefficientfarmingmethods,whichagainleadstosoilerosion.
答案
变化的原因是复杂的。很明显,工厂空气和水的污染影响环境。树木和其它植物死亡,因此土壤侵蚀。死的更多的树,更少的水是地球。需要木材为燃料和建筑会导致进一步的砍伐森林,导致水土流失。当地的农民发现它越来越难以谋生。他们最终使用低效的农业方法,而这又会导致水土流失。
问题 更新时间2023/6/13 13:25:00
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