Earth's stratosphere - an atmospheric layer that starts 7.5 miles above the surface - is shrinking. The stratosphere has gotten a quarter-mile thinner since 1980 and will keep contracting. That ...

Spacecraft burning up in the atmosphere are leaving behind metal particles. Scientists are racing to understand if that affects the climate. One risk is that these particles may spark rainbow-colored ...

Mercury is a pollutant that poses a serious threat to humans and ecosystems. In particular, mercury is known to spread to distant areas through the atmosphere. An international research team has ...