来自《耶鲁大学开放课程：环境政治与法律 第1集 第1集》
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Why was the government in the process of acquiring lands为什么政府在六十到八十年代 -
in the 1960s, '70s, and '80s and building parks投入土地建设公园 -
and building large corridors for wildlife?还为野生动物建设大型通道 -
To conserve biological diversity, but also to provide为了保护生物多样性 -
wide-scale recreational opportunities.也可以给人们提供大规模的娱乐区域 -
So why have land acquisition efforts been stalled?为什么这样的措施却停止了 -
Biological diversity loss is also growing,生物多样性不断减少 -
in part because of the chemical threats部分是因为化学物质的威胁 -
that I described earlier in the lecture.我刚才也提到过 -
There are nearly 450 million acres of the United States landscape美国有4.5亿英亩的土地 -
that are routinely sprayed by biocides,经常喷洒杀生剂 -
pesticides of one sort or another.杀虫剂或是其他农药