Yale Environment 360: Globally, oceans contain roughly 60,000 to 80,000 tons of mercury pollution, according to a report published this week in Nature detailing the first direct calculation of mercury pollution in the world's oceans. Ocean waters shallower than about 300 feet (100 meters) have tripled in mercury concentration since the Industrial Revolution, the study found, and mercury in the oceans as a whole has increased roughly 10 percent over pre-industrial times. North Atlantic waters showed the most obvious signs...