Hot times in Earth’s past may presage what global warming could bring.

How do mountains grow? A new hypothesis challenges the legacy of plate tectonics.

The American Southwest's landscape—made digitally.

What could happen if global warming melts Greenland completely?

Geologists monitor the massive volcano under Yellowstone National Park.

How tsunami researchers are trying to get ahead of the next big wave.

Glaciologists are racing to core the largest tropical ice cap before it melts.

How the North Atlantic Oscillation kicks up a commotion in the Northern Hemisphere.

Oxygen is the key to Earth's biodiversity. But it wasn't always so.

New insights into a rare, destructive wind storm.