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.
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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.
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