According to UNEP, up to 8,900 metric tonnes of mercury are emitted each year. It can be released naturally through the weathering of mercury-containing rocks, forest fires and volcanic eruptions, but significant emissions also come from human processes, particularly coal burning and artisanal and small-scale gold mining. Mining alone exposes up to 15 million workers in 70 different countries to mercury poisoning, including child labourers.
read more... http://www.netnewsledger.com/2017/09/06/landmark-un-backed-treaty-mercury-effect/
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