更新时间：2025-08-07 14:28:35
thepopulationoftheearthisincreasingveryfast.humansmustmaketheearthsupporttheincreasingpopulation.thishasmadeitnecessaryforagricultureandindustrytodeveloprapidly.
sucharapiddevelopmentproducesmoreandmorewaste,whichgoesintothewater,thesoilandtheair.someofitismadeharmless.however,wherethereistoomuchofit,thepoisonouswastemaydogreatharmtothethingsaroundthepeople.
whenfarmersaddfertilizertothesoiltomakeplantsgrowbetter,orusepoisontokillpests,poisonissentintotheair,thewaterandthesoil.whenbirds,fishandpeopleeatthegrain,drinkthewaterorbreaththeair,harmwillbedonetotheirhealth.
theairinbigcitiesisoftenmadeverydirtybycarsandfactories.millionsoftonsofwasteandpoisonousgasesaresentintotheairwiththesmoke.insomeplaces,littleisdonetomakethesmokecleanbeforeitgoesintotheair.
fortunately,peoplearebeginningtorealizejusthowseriousthewholesituationis.inmanycountries,lawshavebeenmadetostopfactoriesfromsendingoutpoisonousgases.
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