Stronger winds and thinner ice are forcing Alaska polar bears to work harder to remain in Alaska, according to scientists who have studied increased movements of both sea ice and bears.

Ned Rozell
Using modern technology to map the floor of Prince William Sound, scientists from the U.S. Geological Survey and other organizations have found the landslide behind the tsunamis that killed about a third of the people in the Alutiiq village of Chenega.Yereth Rosen
Some places in the basin shake harder and longer than others even though they are farther from an earthquake's epicenter. That happened during the 7.1 earthquake, with people in Anchorage reporting more shaking than some on the eastern Kenai Peninsula.Ned Rozell
Researchers say Alaska's ongoing die-off of common murres, an iconic North Pacific seabird, has exceeded the numbers killed by the Exxon Valdez oil spill -- and is likely linked to warmer water temperatures.Yereth Rosen
Some climate scientists are optimistic that humans can eventually reduce the amount of carbon dioxide in the planet's atmosphere. And if that happened, diminished Arctic sea ice could return to former levels.Ned Rozell
When the 1964 earthquake lifted some Prince William Sound islands by several meters, it created new freshwater ponds. Fifty years later, some of the stickleback whose habitat abruptly changed from saltwater to fresh show signs of rapid adaptation.Yereth Rosen
A decade's worth of sampling has revealed the presence of algae-related toxins in marine mammals in the Arctic Ocean, a new study finds -- the farthest north these toxins, associated with warmer waters, have ever been found.Yereth Rosen
Astronomers on Thursday announced that their new billion-dollar U.S. observatory has detected a gravitational wave, a phenomenon Albert Einstein predicted a century ago in his theory of general relativity.Seth Borenstein | Associated Press
A new five-year plan to aid recovery of the endangered Cook Inlet beluga population includes further research on underwater noise in the whales' Southcentral Alaska waters, considers noise restrictions in the Susitna River delta and seeks to improve responses to strandings.Yereth Rosen
A senior Russian government official on Tuesday formally presented to the United Nations his country’s claim to Arctic Ocean seabed, including an area under the North Pole.Andrew E. Kramer | The New York Times