Updates to the Clean Air Act in the early 90’s tightened controls on Midwestern coal-fired power plants, which substantially reduced acid rain. Lakes began to recover…

A crystalline Adirondack lake once held up as an example of a "dead" lake devastated by acid rain has now become a symbol of nature’s ability to heal itself once pollutants are curbed. The surprising thing about the recovery of Brooktrout Lake was how fast it happened. (AP story )

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