The EPA reports that acid rain is still a big problem in the U.S. As long as the atmosphere still contains high concentrations of NOX, SO2, and CO2, it will continue to dissolve into rainwater and damage forests, lakes, and other ecosystems wherever it falls. It can also damage buildings, sculptures, and other structures. Currently the EPA regulates some of these toxins through the Clean Air Act, but it remains to be seen if real emissions regulation will emerge from federal and international agreements like the Waxman-Markey bill or the upcoming Copenhagen Earth Summit.
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