Researchers have found cyanobacteria colonies as big as softballs thriving unexpectedly on shallow Greenland lake bottoms, exuding liver-damaging microcystin. Locals dubbed them "sea tomatoes."
In speeches and planned visits to a threatened village and a receding glacier, President Obama makes the case that global warming is happening now and warrants immediate action.
The Mackenzie River carries the bulk of freshwater flow from North America's tundra to the North Atlantic. But what about the effects of smaller rivers from Canada's Arctic islands?
Field experiments examine the effect of rising temperatures and drying soils on carbon dynamics in the Arctic.
As chair of the Arctic Council, the United States is prioritizing climate change and ocean issues and improving the conditions for Arctic communities.
The proposed U.S. agenda during its chairmanship of the Arctic Council focuses on ocean safety, improving economic and living conditions, and climate change.
"Hot spots" of species richness currently include the Bering Sea, Lancaster Sound, Baffin Bay, and Davis Strait. Will this change as sea ice melts?
The Nereid Under Ice vehicle is helping scientists to explore regions under Arctic sea ice and the biological phenomena that are present there.
U.S. special Arctic representative focuses on key regional issues including environment and economic development.
New techniques are speeding up the slowest-changing landscapes on Earth.