Mark Zuckerberg, Bill Gates, and other tech giants pledged to spark a zero-carbon "economic revolution."
The president said that countries should be held accountable to periodic reviews of emissions targets.
'Invariably, those who have the least bear most of the burden,' says the leader of the forum for nations that will take the hardest hits from climate change.
On day one of the climate summit, Indian Prime Minister Narendra Modi and French President François Hollande made some big announcements.
Ethanol uses up farmland and harms the climate even more than fossil fuels. But it's business, and somebody's making hay.
Soda taxes are finally gaining traction. Next year, they might appear at the polling booth in a city near you.
Guano is even grosser than we thought.
This guide translates the diplomat-speak to more common language.
As major U.N. talks kick off in Paris, the president acknowledged America's role in causing global warming.