Republicans are divided over the future of a major international program.
Ban Ki-moon nominated Mexican diplomat Patricia Espinosa to lead the body’s climate change agency.
Sanders accuses Clinton of backing fracking around the world.
Trump and Cruz are skeptical of the science behind climate change.
Fifty-eight percent of Republicans support working with other countries on climate change.
"We’re like the dummies that everyone laughs at," he said.
In Paris, Obama is tackling two of the biggest challenges of his presidency.
The goal of Sen. Sheldon Whitehouse and other proponents is simply to stifle dissent.
Democrats gave Francis a long round of applause as most Republicans stayed silent.
Catholic Rep. Paul Gosar is skipping Francis's speech over climate change.
The battle has just begun, and the Clean Power Plan is not going to solve climate change.
OPINION: There is a huge divide on the environment, but demographics favor the Democrats.
Green groups think Trump's opposition to Paris climate deal will unify left.
Inspired by the campaign against South African apartheid, student activists are working to end mass...
Coal use is declining in China and the US, which might avert the worst-case warming scenarios.
OPINION | Pope Francis gave added moral authority to Democratic arguments.
"This is a people’s issue, not a party issue," the film star said in Paris.
OPINION | The evidence is clear — just look around you.
The Vermont senator stood by his claim at Saturday night’s Democratic presidential debate.
"It’s astonishing on one level," the former VP says of Republicans' unified denial.
Obama highlights refugee crisis, climate change in his remarks.
One green group warns Obama could have his "Mission Accomplished" moment.
Recently, the conversation has shifted from scientific grounds to morality and ethics.
Research suggests global temperatures are increasingly like to rise.