"According to a new study, mercury levels in many of the world oceans’ surface waters have tripled due to human activity. Because mercury drains into the ocean from mines, coal-fired plants, and sewage, mercury levels are higher in surface waters compared to the deep ocean. The Guardian.
"A recent study found that all penguin species are threatened by habitat degradation. The scientists found that food scarcity, bycatch, oil pollution, and climate change were the biggest threats to penguins, and that management plans reflect these issues. Phys.org