Caribou, migrating birds and many other types of wildlife rely on this expanse of wetlands and tundra. Humanity and the climate depend on a healthy Arctic, too.

Alaska produces a lot of crude oil, but many of the state’s utilities, businesses and homes run on natural gas, which is in dwindling supply near population centers.

When volcanoes like Alaska’s Mount Spurr erupt, the ash can damage people’s lungs, smother crops and kill animals, and the harm can continue to spread long afterward.

Donald Trump says he is a big fan of oil and gas. His actions may not be of great interest to the industry. And the results may not be what he says he wants.

The US experiences violent earthquakes, but the damage and death toll is much lower than in many countries because of the work of federal seismologists and engineers.

Rapid changes underway in the Arctic affect the region’s people and wildlife, and the entire planet.

The Juneau Icefield may now keep melting even if global warming stopped.

Archaeologists preserve records of their excavations, but many are never analyzed. Digital archaeology is making these records more accessible and analyzing the data in new ways.

Collaborative research by archaeologists, environmental scientists and tribal elders combines science and Indigenous knowledge to tell the story of centuries of life at a glacier’s edge.

The early heat melted snow and warmed rivers, heating up the land and downstream ocean areas. The effects harmed salmon fisheries, melted sea ice and fueled widespread fires.