¿ªÔÆÌåÓý

A plume of smoke and soot stretches for thousands of miles from the province of Quebec province across the Atlantic Ocean, as seen in satellite images from NASA.

Air quality in parts of northern Vermont dipped to what the EPA calls "very unhealthy" levels on Sunday night. It's a pattern the state could see more of with climate change.

Dive into the four elements of antiquity: Fire, Water, Earth and Air in this multimedia presentation of Timeline:Elements, featuring lecture and live�