应该是加 “the”吧
我查过字典的,例句
“We shall never understand the natural environment until we see it as a living organism”(Paul Brooks)
“只有把自然环境看作一个活的有机体,我们才会理解它”(保罗·布鲁克斯)
to prevent the pollution of the environment
防止环境污染
The rural environment lent itself to the restoration of his health.
农村环境有助于他恢复健康.
相信我,我查过的,你可以在网上搜到第一个例句的,
不加的时候可能是专有名词,如
home environment
家庭环境
就像前面某人的回答一样