How carbon dioxide's rise was discovered.
A vast grid of surface detectors is revealing Earth’s hidden insides.
Annual ozone holes still occur, but Earth’s ozone layer is mending.
Geologists study earthquake risk in a crowded country.
The Arctic’s frozen waters have entered a radically new state.
How a deep-drilling experiment is fighting climate change.
Scientists analyze ancient glaciers to understand climate change today.
Drought stressed the groundwater stores of the southern United States in 2011 and 2012.
In 2010, El Niño switched quickly to a strong La Niña, resulting in intense weather.
Scientists map Port-au-Prince's earthquake zone in detail.
Volcanologists keep wary watch on Sicily's restless peak.
Ancient crystals reveal Earth's earliest era.
An innovative twin-satellite mission is watching water move across our blue planet.
Hot times in Earth's past lend insight to future warming.
A new hypothesis of mountain growth challenges plate tectonics.
A digital landscape of the American Southwest.
What could happen if global warming melts Greenland completely?
Geologists monitor Yellowstone National Park's volcanic system.
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.
Have you heard of the North Atlantic Oscillation?
Oxygen is the key to Earth's biodiversity. But it wasn't always so.
New insights into a rare, destructive wind storm.
Scientists are studying earthquakes from far above the tremors.
The Arctic National Wildlife Refuge is rich in oil. What’s at stake?