Polar bears – at least New York's Polar Bear Club comprised of cold-water swimmers – might be facing extinction due to the lack of, well, cold water.

The ultimate seed vault is being carved into a frozen, Arctic mountainside. And it will be guarded by polar bears.

Signs of global warming were visible all over the Arctic this winter, from hungry polar bears stalking children to sea ice breaking up months earlier than normal. Inuit residents of villages near the Arctic circle say they can no longer read the weather in the sky, because of what scientists say are changing sky patterns caused by layers of warm air.

You've seen them looking a little too skinny in recent photos, lumbering around with their skin sort of sliding on their frames. Now, environmental groups are fighting for their future