Millions of people around the world suffer—and many die prematurely—because of air pollution. The culprit: fossil fuel burning. It's poisoning the air we breathe and pushing up carbon emissions. Air pollution and climate change are two sides of the same coin: improve the quality of the air we breathe, and that will immediately make us healthier. It will also bring down the carbon and methane emissions that trap the sun’s heat, raising our planet’s temperature. Rich Fuller is the founder and president of the nonprofit Pure Earth, which is dedicated to solving pollution problems in low- and middle-income countries. Mr Fuller also co-chaired the landmark Lancet Commission on Pollution and Health.