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 same quality levels as they were in 1975. In short, viewed in the aggregate, nothing has changed.
8 Temmuz 2012 Pazar
Clean Water Act Has Been Ineffective In Improving Water Quality In Fresh Water Lakes: Water Today At Same Quality As In 1975
To contact us Click HERE From the abstract to "Has Surface Water Quality Improved Since the Clean Water Act?" by V. Kerry Smith and Carlos Valcarcel Wolloh, NBER Working Paper No. 18192, June 2012: