While Rêgo da Silva says it’s difficult to establish a direct link, many environmentalists in the area believe the mercury is likely a key contributor to the dwindling number of fish in Rio Fresco – a sentiment that some global studies echo. Across Brazil, as much as 221 metric tons of mercury are released into the environment each year due to illegal mining, preliminary studies showed in 2018.
read more... https://news.mongabay.com/2019/12/illegal-gold-rush-causing-irreversible-damage-to-rivers-in-the-brazilian-amazon/
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