Mercury gets into the air and water from manmade sources such as the burning of fossil fuels. An estimated 37 percent of current annual human mercury emissions are due to such burning, mostly coal. Another 25 percent of emissions are estimated from small-scale gold mining.
China and India have dominated total mercury emissions over the past decade or so. But even with their gains, mercury emissions peaked in the 1970s and have been “relatively stable” since, according to a report last year.
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