Mercury is released to the environment in several ways, but the dominant pathway for long-range transport is atmospheric emissions and deposition. Total mercury emissions are made up of primary sources that transfer mercury from geologic reservoirs to the atmosphere and can be natural or human-generated, and secondary (re-emission) sources. Today, roughly two-thirds of the mercury emitted to the atmosphere annually originates from current and past human activities since industrialization (Corbitt et al. 2011). The two largest primary anthropogenic sources of atmospheric mercury emissions globally are stationary fossil fuel sources, primarily coal-fired power plants; and artisanal gold mining, a source that appears to be widely underestimated
http://www.scribd.com/doc/216317983/Sources-to-Seafood-Report
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