Negotiators Remain Hung Up Over Disputes
Copenhagen, Denmark
Negotiators 
Remain Hung Up Over Disputes
PLAY
Exxon Mobil Will 
Buy XTO Energy
PLAY
BUSINESS
Poorer Countries Upend Climate 
Talks
PLAY
WORLD
Protests and a 
Financial Pledge
PLAY
SCIENCE
Video
More video from The New York Times is available at http://nytimes.com/video