The answer has to do with the air we breathe and that bright white snowpack, as an atmospheric scientist in Colorado explains.

Solar cycles, sea ice and rising electricity use all play a role. So does an unhealthy surprise that has been quietly hiding a large amount of global warming – until now.

Climate change is making people sicker and more vulnerable to disease. Erasing the federal endangerment finding increases the risk.

When attacks disrupted shipping lanes in the Red Sea, few scientists imagined the effects would reach the clouds over the South Atlantic.