Toxic mercury levels are actually declining in Alaskan polar bears—but that's not as great as it sounds

It's because they're forced to eat human leftovers. The mercury might be rising in the thermometer, but not in these bears. Alan D. Wilson Imagine: vast expanses of frozen sea, stretching from the northern coast of Alaska into the Arctic horizon. Welcome to the Southern Beaufort Sea—or at least, the Southern Beaufort Sea as it used…