Scientists are concerned that acid deposition may be damaging substantial numbers of U. S. and Canadian lakes and streams. As part of its assessment of trans-ported air pollutants, OTA contracted with The Institute of Ecology (TIE) to: ● describe mechanisms by which acid deposit ion may be affecting sensitive 1akes and streams; ● providc an inventory of Eastern U.S. lakes and streams considered to be sensitive to acid deposit ion; ● estimate the number of lakes and streams in these scnsitive regions that have been affected and/or altered by acidic deposition; and ● examine three scenarios for future sulfate deposition levels to the year 2000, and project effects on sensitive aquatic resources. Because of ’ scientific uncertainties and data limit ations, none of these tasks can be addressed at this time with a high degree of accuracy. Each of ’ these topics i
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