Brazil is suing two multinational mining companies connected to the collapse of a dam that killed 13 people and displaced hundreds, while ravaging river ecosystems and polluting part of the Atlantic Ocean with mud and wastewater containing toxic levels of mercury, arsenic and other metals.
The marine food chain has another threat as warming waters lead to increased uptake of mercury pollution by some species of fish.
The FDA and EPA already warn against pregnant women and children eating canned tuna because of high mercury levels, but The New York Times has discovered even more mercury in a random selection of fresh sushi tuna. And it's not just those swanky city folk who are at risk. According to one marine scientist: "Mercury levels in bluefin [tuna] are likely to be very high regardless of location [of purchase]."