Scientific American: When the summer sea ice goes, the Arctic will lose the ivory gull, Pacific walrus, ringed seal, hooded seal, narwhal and polar bear–all animals that rely on the ice for foraging, reproduction or as refuge from predators. And the sea ice is going, faster and faster: In the past 30 years, minimum sea ice cover in the Arctic Ocean has declined by 45,000 square kilometers annually*–an area twice the size of New Jersey is lost each year. “Sea ice is like rainforest in the tropics. There …