Winter is setting in across the Northern Hemisphere, and with it, cold and cloudy winter days. Clouds play a vital role in the environment, providing rain but also reflecting sunlight before it ...

Earth is reflecting less sunlight, and absorbing more heat, than it did several decades ago. Global warming is advancing faster than climate models predicted, with observed temperatures exceeding ...

A city council meeting in Alameda, Calif. on Tuesday will take center stage in the global controversy over whether to try cool the planet by making clouds brighter. Researchers at the University of ...