Inside the Solar Impulse 2, a 5,000-pound plane powered by nothing but sunshine.
A new Sierra Club service will message you when the air gets really bad in your area.
It's the Germans' answer to Amazon drones, and it's way, way better.
Watch the Human to Mars summit livestream this week, and see how NASA plans to get our asses to Mars.
The Obama administration's proposed rules for power plants could save nearly 5,000 lives a year in the U.S. alone.
The oil giant wants to park its Arctic drilling rigs in Seattle's port, but the city is throwing up roadblocks.
California has the most ambitious climate plan in the nation, but if it loses too many trees to fire, it will have a hard time meeting its targets.
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Fifteen percent of Democrats in a new poll said climate change was their top priority. That’s enough to push the issue into the spotlight.