Nitrogen is essential to all living systems, which makes the nitrogen cycle one of Earth's most important nutrient cycles.

Weather and climate topics associated with wildland fires.

Background information on hurricanes, typhoons and cyclones, including frequently asked questions.

Residents of the mid-Atlantic can be forgiven if they’re craving a bit of calm. The weekend of 5–6 February brought what’s been variously dubbed Snowpocalypse II, Snowmageddon, Snowtastrophe, and the Superbowl Superstorm.

A new study led by NCAR scientist Peter Lawrence has found that impacts to Earth's hydrological cycle are the most important driving force in how land use changes affect climate.