In the 19th century, the sky already bore the marks of our industrial era. Long before gasoline engines, the atmosphere was ...

Clouds play an important role in regulating the climate. Bright ones at low altitudes generally reflect solar energy away, ...

The amount of methane added to the atmosphere in the past decade also corresponds to studies that show fracking operations leak, vent, or flare between 2 and 6 percent of the gas produced, Howarth ...