Environment Does Air Pollution Undermine Solar Energy? A new study shows that poor air quality has reduced the amount of sunlight reaching China's solar installations, undermining the country's renewable energy efforts. Kate Wheeling
Environment Air Pollution Is Killing More People Than Smoking—and Fossil Fuels Are Largely to Blame A new study finds that air pollution caused by fossil fuel emissions is killing millions and disrupting the water cycle. Sharon Zhang
Environment The Coming Haze of Global Warming Models suggest atmospheric aerosol concentrations will increase as the temperatures keep climbing—and that's bad news for your lungs. Nathan Collins