Acid Rain Poses a Previously Unrecognized Threat to Great Lakes Sugar Maples

"The number of sugar maples in Upper Great Lakes forests is likely to decline in coming decades, according to University of Michigan ecologists and their colleagues, due to a previously unrecognized threat from a familiar enemy: acid rain." Sugar maple trees in Canada and northern US have recently decreased in abundance due largely to acidification of calcium-poor granitic soils in response to acid rain.

Article Source: http://www.sciencedaily.com/releases/2011/12/111215135933.htm