A new study has found permafrost at outposts in the Canadian Arctic is thawing 70 years earlier than predicted.

Across the Far North, populations of caribou — an indispensable source of food and clothing for indigenous people — are in steep decline. Scientists point to rising temperatures and a resource-development boom as the prime culprits.

Every year, Aklak Air switches to flying a Twin Otter to Sachs Harbour in the spring and fall because the gravel runway is too soft for other aircraft. The switch usually lasts for a few days, up to a week, but this fall's warm weather made it necessary for longer and its effects were felt beyond the runway.