Levels of mercury are rising in Hawaiian yellowfin tuna, well-known as ahi, at a rate of nearly four percent a year. The oceans are absorbing the pollutant from air, said researchers Monday. Coal-fired power plants and artisanal gold mining operations produce mercury, a potent toxin that makes its way into the world's water and poses a health risk to people who eat certain fish. "Mercury levels are increasing globally in ocean water, and our study is ...
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