Positive news about the environment is as common as a well-fed polar bear. So enjoy. Thanks to a decrease in coal use in North America and better technology to make the fossil fuel less harmful, the amount of mercury in the atmosphere is on the decline—and our air, our oceans, and even our food appear to be getting safer. Mercury levels in Atlantic bluefin tuna plunged by 19 percent from 2004 to 2012, according to a study published in Environmental Science & Technology that examined more than 1,000 specimens. That correlates with a 20 percent decrease in mercury in North Atlantic air from 2001 to 2009, the study notes, meaning that human efforts to decrease the amount of mercury in the atmosphere appear to be paying off.
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