(Editor’s Note: This file presents news and information from the Copenhagen climate change conference on Dec. 15, distilled from news outlet reports. Check for updates during the day.)

: In a report released at the conference, the U.S. Dept. of Agriculture says climate change is already affecting America and "poses significant threats and challenges for farmers, ranchers, and those who make a living off the land, which will have a serious impact on our ability to feed the people of the United States and the world."

President Obama is literally calling on world leaders to make a climate deal in Copenhagen. According to The Los Angeles Times, the president, who is coming to the conference Friday, is making round-the-world phone calls, hoping to solidify some kind of agreement.

A worldwide grassroots green revolution is needed to attack the climate change crisis, California Gov. Arnold Schwarzenegger says in a speech today in Copenhagen. The governor, who once boasted of owning five gas-guzzling Hummers, said his state’s clean energy initiatives should be emulated by the nation and the world. : A Grist columnist describes the governor’s speech as "a shockingly defeatist speech tricked out with sunny language about private-sector innovation."

With only a few day before the world’s leaders arrive in Copenhagen, it’s time for things to start happening at the conference, says the U.N. climate chief. Progress is "too slow."

The pope today weighed in on the climate crisis, calling it a moral issue that the world’s nations must urgently address.

Check out The Copenhagen News Collaborative for a variety of blog reports from Copenhagen.