Just what exactly is permafrost? And what is happening now that it's warming up? To find out, we enter the Arctic Circle's secret world of ice and frozen history.

Ocean acidification threatens some of Alaska’s most lucrative crab fisheries. But there’s one ray of hope: it’s possible that crabs might be able to adapt to the changing oceans. The big question scientists are researching at Bob Foy’s lab in Kodiak is – will they have enough time?

Twice as many reindeer have been killed on the roads in northern Sweden this month compared to the same period last year.

The storm that walloped Southcentral Alaska also left about 32 inches of snow in Moose Pass and 30 in Seward.

Packed ice crystals have pushed up water levels on the Kokemäki River, soaking some buildings in Huittinen and Pori.

Four teams had scratched as of 7 p.m. Saturday because of the icy conditions, said Kuskokwim 300 race director Madelene Reichard. "It's the same thing for all of them," Reichard said. "The dogs aren't used to running on the ice, and people were wanting to keep their dogs healthy."

Winter rain makes it more difficult for the animals to feed, particularly pregnant females, researchers found.

Three people died earlier in the Netherlands in accidents caused by hurricane-strength winds.

Due to consistent above average winter temperatures, there are many known and developing open holes on the river. I was on the trail working at the Bogus Creek Checkpoint. Most of the trail had no snow cover, and the majority of the race was run on glare ice over the tundra.

Homeowner Bart Henderson headed back to Haines from Mexico after a fuel-feed line from a heating oil tank to a furnace burst and potentially leaked. “We’ve got a pretty good idea that the cause of the leak was from the hard freeze and then the warm weather,” Pikul said. “There was some frost heaving of the ground and it compromised the feed line.”

A fierce storm sweeping across northern Europe kills eight people and halts Dutch and German trains.

The Alaska Board of Fisheries faces some tough decisions this week. One of those is how to conserve dwindling king salmon stocks in a way that won’t financially cripple Southeast salmon fishermen.

Environmental and economic changes could make it easier for non-native plants and animals to gain a foothold in the North.

Residents use drones to show unusual sea ice conditions along the Chukchi coast.

In 2014, a warm water system — known as the Blob — wreaked havoc in the waters of the Gulf of Alaska. The relationship between extreme weather events and climate change is complicated. But scientists are getting closer to figuring out how the two are linked.

T. gondii infection in people was found to be associated with drinking water from home water tanks where T. gondii parasites remained, clinging to the walls—so cleaning of these water tanks would be one way to reduce infection.

The «Baltic Winter» spent only about five and a half days on its voyage across the Northern Sea Route. Last year’s ice conditions in the area were favorable, Russian transport authorities say.

For the first time, the race will run two laps to its halfway point and back. Mushers agree it’s the safest way to run the race, but it could present challenges.

Mid-January robin sighting in Chuathbaluk.

Favorable ice conditions meant that the ship »Baltic Winter» spent only about five and a half days on its voyage across the Northern Sea Route.