砍伐树木森林被毁过度放牧破坏了草场排污污染了河流排放温室气体捕猎使大量物种灭绝破坏臭氧层大水漫灌使土壤盐碱化.使用生化武器污染了环境.制造基因生物威胁到生态平衡抽取地下水使地表下降.Tree felling forests destroyedOvergrazingdestroyed thepastureSewagepollutionofriversGreenhouse gas emissionsHuntinga large number ofspecies extinctionDamage the ozone layerFlood irrigation, chemical and biological weaponspollutes the ofgenetically modified organismsisathreattotheecological balanceExtraction of groundwatertothe surfacedown.