from TreeHugger.com
by David DeFranza
Images of polar bears hopelessly adrift on ice rafts are compelling, but the species faces other more subtle threats as well. It has long been known that mercury, which finds its way into snow and water from such human sources as coal-burning power plants, incinerators, and chlorine-producing plants, can travel up the food chain. Now, new research is showing exactly where mercury enters the polar bear diet, with findings that suggest much more severe exposure in... Read the full story on TreeHugger
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