The latest news on Arctic
Experts worry about potential risks as nations move to exploit the region.
Climate change creates new oil, shipping concerns in neighborhood shared with Russia.
The landscape is more than twice as long as the Grand Canyon and could play a role in sea-level rise.
A reduction in ice coverage can impact commercial activities and coastal jobs.
Millions of years ago, the Arctic had temperatures that reached the low 60s.
Extreme heat waves 'track along with increases in temperatures,' experts say.
Arctic encroachment, Venezuelan narcoterrorism among top threats, officials say.
The United Nations warned Wednesday that climate change is "taking place before our eyes."
Scientists say the leak is likely smaller than that of other human-influenced methane sources.
Oil speculated to be beneath the Arctic Refuge would add less than 1 percent to global oil production.