The Contrail Effect

Are vapor trails from aircraft influencing the climate, and if so, should we worry?

The Producer's Story

Filmmaker David Sington offers his personal take on why many people remain skeptical about global warming. Join the discussion.

Discoveries in

Global Dimming

From an 18th-century volcanic eruption to a 21st-century satellite, see what paved the way to our understanding of this phenomenon.

Clean Air Technologies

Explore a handful of creative solutions to help reduce pollution, like exhaust-eating algae and wind energy.