Melting ice and snow due to climate change has already accounted for 40 percent of recent increases in ocean levels.
A final refuge of Arctic summer sea ice may be the last outpost for polar bears. But that doesn't mean they're in the clear.
Held up in legislative limbo in the United States, the Law of the Sea treaty could give other nations the authority to tap into natural resources in the Arctic.
Would you risk a Gulf of Mexico-type oil spill in the pristine U.S. Arctic Ocean? If things continue as planned, we'll all take that gamble when drilling begins on July 1.
Methane is leaking into the atmosphere from permafrost in the Arctic Ocean and could accelerate global warming.