House Republicans warn Obama on climate steps | Reuters

Barton, who would take over a powerful House committee that oversees environmental policy if Republicans were to regain majority control of the House, said he does not believe industrial emissions of carbon dioxide contribute to global warming and fears capping them would hobble the economy.

"If I am chairman two years from now, I'm going to repeal" measures such as U.S. funding to help developing countries battle climate change, outlined by Secretary of State Hillary Clinton on Thursday, the conservative Texas congressman boasted.

Castro mocks Obama visit to Copenhagen

Veteran Cuban leader Fidel Castro on Friday dismissed US President Barack Obama's trip to UN climate change talks in Copenhagen as a "show," and complained that the world's poor will shoulder the burden of any summit agreement.

Twitter / AP Climate Pool

Waiting for that #Copenhagen Kodak moment? Forget it _ looks like there'll be no family photo at #Cop15

Twitter / David Corn

As Obama, HRC, and aides walked past, they all looked stone-faced. #cop15 #Copenhagen