Obama to vow greenhouse emissions cuts in Denmark

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President Obama speaks during the pardoning of the National Thanksgiving Turkey, Courage, in a ceremony in the North Portico of the White House, in Washington, Wednesday, Nov. 25, 2009, (AP Photo/Pablo Martinez Monsivais)

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Obama to vow gre... President Obama speaks during the pardoning of the National Thanksgiving Turkey, Courage, in a ceremony in the North Portico of the White House, in Washington, Wednesday, Nov. 25, 2009, (AP Photo/Pablo Martinez Monsivais)
Shuttle Atlantis... This image from NASA TV shows the Space Shuttle Atlantis doing it's fly around passing behind the Russian segment of the International Space Station shortly after undocking from the International Space Station early Wednesday Nov. 25, 2009. The Poisk can be seen at right. The shuttle is scheduled to land at the Kennedy Space Center, Friday morning. The (AP Photo/NASA)
Ships warned abo... In this Nov. 16, 2009 photo released by the Australian Antarctic Division, an iceberg is seen at Sandy Bay on Macquarie Island's east coast, in the Southern Ocean 1,500 kilometers (930 miles) southeast of Tasmania, Australia. It is very rare to see icebergs from Macquarie Island and is uncommon to find icebergs in this general region. (AP Photo/Australian Antarctic Division, Eve Merfield)
Big Bang atom sm... Scientists gather at the European Organisation for Nuclear Research (CERN) data quality satellite control center of the ATLAS detectors during the restart of the Large Hadron Collider (LHC) in Meyrin, near Geneva, Switzerland, Monday, Nov. 23, 2009. Scientists turned on the Large Hadron Collider on Friday night, Nov. 20, 2009, for the first time since the machine suffered a failure more than a year ago and had to be shut down shortly after the start. (AP Photo/Keystone, Laurent Gillieron)
Comatose for 23 ... Belgium's Rom Houben uses his touchscreen and assistance of his speech therapist Linda Wouters, left, to communicate during an interview at the service center ' t Weyerke in Zolder, Belgium, Tuesday, Nov. 24, 2009. Houben was misdiagnosed for 23 years as being in a coma until a doctor at Liege University discovered three years ago that Houben's brain was still functioning. Houben was diagnosed as being in a vegetative state following a car crash in 1983. The discovery took place three years ago but only recently came to light, after publication of a study on the misdiagnosis of people with consciousness disorders.(AP Photo/Yves Logghe)
Atlantis leaves ... The bright sun greets the International Space Station in this photo taken from the Russian section of the orbital outpost by one of the STS-129 crew members
Experts scan dis... People hold a Chinese national flag ahead of a raising-flag ceremony during a photo call at Yangren Street in Chongqing Municipality, September 29, 2009
Darwin debate ra... Pigeon bones are displayed in Charles Darwin's former home Down House, Kent, southern England
Big Bang machine... Scientists look at a computer screen at the control centre of the CERN in Geneva
Dark ocean depth... A rare "Dumbo" octopod is seen in the depths of the ocean in this undated handout photo