National Geographic: In addition to heating up faster than almost anywhere else on the planet, the Arctic has gotten wetter and snowier because of global warming, according to a new study. The extra precipitation could freshen ocean water in the Arctic and North Atlantic, researchers say, which might disrupt the so-called ocean conveyor belt, a current that runs through the Atlantic and carries warm water northward from the Equator. The new study is the first to show that changes in precipitation …