Fossil fuels account for about one-quarter of this increase, but lately the leading contributor has again been artisanal and small-scale gold mining. This kind of extraction has released roughly 1,220 tons of mercury in 2015 alone (nearly 40 percent of that year's global total).
read more... https://arstechnica.com/science/2021/06/mercury-is-accumulating-in-deep-ocean-trenches/
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