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Antarctic krill — tiny, filter-feeding crustaceans that live in the Southern Ocean — have long existed in mind-boggling numbers. A 2009 study estimated that the species has a biomass of between 300 million and 500 million metric tons, which is more than any other multicellular wild animal in the world. Not only are these teensy […]

Researchers looked at the distributions of more than 46,000 tree species around the world and found that more than 13% have no protection. For all species examined, at least half of their distribution lacks protection.

Climate researchers often use the Arctic as a bellwether for the impacts of global warming because the region is particularly sensitive to even small shifts in surface temperatures.