A tundra fire has burned nearly 2,000 acres on the Selawik National Wildlife Refuge over the past week.

Sixty years ago there were 12 of these such cellars in Kaktovik.Today there is only one left. All the other family cellars have been flooded and have collapsed.

Facilities for producing weapons grade plutonium believed safe despite fierce flames caused by wildfires.

A wildfire is burning in a remote area of northwest Alaska. The Alaska Fire Service reports that the Zane Hills Fire was discovered this week, and mapped at 1,900 acres.

Alaska Division of Forestry spokesman Norm McDonald said the 2-acre fire's exact cause has not been determined but is suspected to be similar to that of four smaller Mat-Su wildfires earlier Thursday. Those blazes were tracked to backfires from a white Chevrolet pickup truck.

For years now, buildings in Inuvik have been sinking due to thawing permafrost. It's part of a worrying trend across the Arctic, writes David Michael Lamb.

The aim is to give warnings over seismic activity that could lead to the sudden formation of new craters, which could potentially damage key industrial infrastructure.

Scientists rush to site of latest tundra eruption - which formed a crater 50 metres deep - amid fears for homes and key industrial sites.

Detailed study of satellite data has identified more than 200 lakes with active methane emissions.

The unexpected appearance of sinkholes or groundwater flooding is something to which residents have grown accustomed.

The bulges are caused when permafrost beneath the soil melts due to "abnormally warm" weather - allowing methane gas to escape and head to the surface