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After months of hedging, Democratic presidential candidate Hillary Clinton came out against the Keystone XL pipeline. She did so as much of the media attention was focused on Pope Francis' landing.

Many political leaders were visibly moved by the mere first-ever presence of a pope in the chamber, but the speech itself was full of politics.

Efforts to change the mountain's name back to Denali date back to 1975. The White House says changing the name back "recognizes the sacred status of Denali to generations of Alaska Natives."

A month and a half after detecting the leak in its Aliso Canyon storage facility, Southern California Gas Co. still hasn't been able to stop it.

For a while, the president's plan for increasing vehicles' fuel efficiency worked; he said it would save money and reduce carbon pollution. Then came cheap gas, and the improvements have stalled.

New research reveals that the amount of methane from oil and gas operations is much larger than previously thought. But the recent uptick in methane emissions seems to be from agriculture.

"We are facing so many situations of disasters. We badly need a symbol of hope. I strongly believe Cyprus can be the symbol of hope at the beginning of 2017," the U.N. Secretary-General said.

Google sifted through 5 million satellite images to create a series of zoomable, time-lapse videos depicting the human impact on the planet.

For years, British environmental activist Mark Lynas vandalized genetically modified food crops. Then, he had a change of heart. He went in front of the world to reverse his position, telling the anti-GMO lobby to "get out of the way and let the rest of us get on with feeding the world sustainably."

Since 1958, researchers have been measuring the amount of carbon dioxide in the atmosphere at the Mauna Loa Observatory. The remote outpost has just reported a carbon dioxide level of 400 parts per million — the highest it has climbed in the modern age.