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.