Has Surface Water Quality Improved Since the Clean Water Act?
收藏NBER2012-06-01 更新2025-01-04 收录
下载链接：
https://www.nber.org/papers/w18192
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资源简介：
On the fortieth anniversary of the Clean Water Act this paper reports the first quantitative assessment of the aggregate trends in water quality in the U.S. using a single standard over the years 1975 to 2011. The analysis suggests that fresh water lakes for the nation as a whole are about at the
提供机构：
美国国家经济研究局
创建时间：
2012-06-01
