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House Speaker Nancy Pelosi said despite Trump's decision to withdraw from the Paris accord, the U.S. is committed: "We're still in it." The sailing yacht with Greta Thunberg aboard will arrive soon.

Natural disasters, protests and stark scientific reports are heightening concern over climate change. And companies are under pressure from banks and investors to green their corporate images.

Carbon emissions from global air travel are rising fast, and U.S. passengers make up the largest share. But some are vowing not to fly at all, motivated by guilt and concern for the environment.

A United Nations report warns that greenhouse gas emissions from the world's largest economies must drop dramatically in the next decade to avoid the most catastrophic effects of climate change.

A sweeping study in The Lancet finds that longstanding progress in treating diseases and reducing childhood deaths is in jeopardy.

Under the agreement hammered out in 2015, the first day that countries can reverse the promises they made is Nov. 4, 2019. It will be another year before the American withdrawal is official.

"It is a huge honor," the Swedish activist said of the Nordic Council Environment Prize. "But the climate movement does not need any more awards."

New research from the National Audubon Society finds two-thirds of North American birds are at risk of extinction due to climate change.Scientists…

The university, which is as big as a city, has slashed its carbon emissions since 2004. That effort is now paying for itself in lower energy costs. Could actual cities do the same?

The U.N. Intergovernmental Panel on Climate Change has released its latest report on the oceans, and it's not good. The report also notes a relatively new phenomenon in the oceans: marine heat waves.