Glacier Meltdown: 500 Million Tons of Lost Ice (S2, E4) | Mega Disasters | Full Episode

Resident Captures EF3 Tornado Tearing Through Neighborhood

Extremely dangerous tornado hits Wisconsin

Floods swell over roads in the Southwest

Save Polar Bears and Plant Trees: Countdown Fundraiser for the Planet

Albertosaurus in Modern Canada: What Went Wrong?

After three days of dealing with smoky, particulate-filled air, many Philadelphians went outside Sunday to enjoy the sunshine, gentle winds, and relatively clear horizons. But hundreds of miles northwest in Ontario, wildfires continued to burn, posing a life-threatening emergency to some Canadians and leaving much of the United States susceptible to more rounds of smoke. Experts say the ongoing wildfires will threaten air quality in the region, while the longer dry seasons, droughts, and high wi