SEA ICE

The ice that lies in the Canadian Arctic may play a larger role in sea level rise than anyone thought.

The United States is staging high-profile submarine exercises in the Arctic Ocean this month as evidence mounts that global warming will lead to more mining, oil production, shipping and fishing in the world's last frontier.

The recent snowstorms in the northeastern U.S. and a similar blizzard last year might make some doubt the climate is changing. The short answer is: no, and in fact some of the people who study climate predicted wetter winters - and more snow, at least for a while.

There’s hope for polar bears, but it depends on human behavior.