第二,为了能够满足增长的人口数量,农业活动也必须随之增加。农业的增加的代价是进一步破坏鸟类的栖息地,越来越多的荒地变成了农业用地。因而,鸟类在乡村的数量也随之持续减少。
Third, as human settlements expand and agriculture increases, the use of chemical pesticides will also increase. Pesticides are poisons designed to kill agricultural and home garden pests, such as insects, but inevitable, pesticides get into the water and into the food chain for birds where they can harm birds. Birds that eat the poisoned insects or drink contaminated water can die as a result, and even if pesticides do not kill birds outright, they can prevent them from reproducing successfully. So, pesticides have significantly contributed to declines in bird population, and because there will continue to be a need to control agricultural pests in the future, this decline will continue.
第三,随着人类居住地的扩展和农业的发展,化学农药的使用也增加了。农药是用来杀死诸如昆虫之类的生长在农田或者菜园的害虫的有毒物质。不可避免的是,这些农药会进入水系和食物链,进而伤害鸟类。鸟类会吃被毒死的昆虫或者喝污染了的水。这样会导致鸟类的死亡,即便不会不会导致鸟类的立刻死亡,也会影响鸟类的繁殖。所以,杀虫剂会对鸟类的数量有非常严重的影响。同时,因为即便是在将来,还是需要杀虫剂来控制农业害虫,所以,鸟类数量减少的趋势难以改变。
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