Most of us first spot them as children—the white lines in the blue sky that are the telltale sign of a flight overhead. Contrails are an instant visual reminder of air travel, and a source of much ...

Earth's climate has changed throughout history for numerous reasons, but modern climate change is driven by human behavior.

January in Russia conjures up images of Muscovites crunching through the snow in bulky coats -- not bunches of delicate snowdrops blooming in grassy areas around still-standing Christmas trees.

A new study finds that the rate of ocean warming has more than quadrupled over the past 40 years — and pinpoints why.

A third of the Arctic is now emitting climate-changing greenhouse gasses after thousands of years of storing them, according ...

How can we be certain that human-released greenhouse gases are causing the warming? How much more will the Earth warm? How will Earth respond? Answering these questions is perhaps the most significant ...