"In February 2009, the MPCA released a study showing that methylmercury levels in large Minnesota fish including northern pike and walleye had increased unexpectedly. Mercury levels had declined by 37 percent between 1982 and the mid-1990s, but have since increased by 15 percent. The analysis, which was based on tissue samples from fish collected from over 800 state lakes, concerns scientists because the mercury is toxic to humans and wildlife. The agency said that a local source of mercury is not likely to be responsible. Instead, mercury pollution from coal-fired power plants outside the state and factors related to global climate change are probably to blame."
Mercury and coal - SourceWatch:
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