New research demonstrates that an increase in greenhouse gas concentrations thousands of years ago was a key factor in causing substantially more rainfall in two major regions of Africa.

An introduction to El Niño, La Niña, what we've learned about them — and where research is headed next.

Find answers to questions about these atmospheric patterns, which play a key role in year-to-year weather and climate variation around the world.

There's major disagreement among scientists on exactly what might be causing a tendency toward colder winters over the last few years in places like the central and eastern United States, Europe, and Russia.

If today’s tools for multiyear climate forecasting had been available in the 1990s, they would have revealed that a slowdown in global warming was likely on the way, according to new research.