How is the production of mercury from burning coal an environmental hazard?

Mercury released when coal burns can settle into lakes and rivers. There, microorganisms can transform it into methylmercury, a toxic substance that builds up in aquatic animals and can harm wildlife and people who eat them. Mercury does not cause global warming in the way choice A describes, and it does not combine with coal emissions to produce ozone, so “all of the above” is not correct.

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