[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/11/25/art.getty.obama.2.26.jpg caption="Obama to go to Copenhagen climate-change summit ."]Washington (CNN) - President Barack Obama will go to Copenhagen, Denmark, next month for a major climate-change summit, the White House announced Wednesday.
Obama is prepared to offer a goal of the United States reducing emissions to 17 percent below 2005 levels by 2020, the White House said in a news release.
The White House also reiterated Obama's goal of reducing U.S. emissions by 83 percent by 2050.
The targets come from a climate-change bill passed earlier by the House of Representatives - but not yet by the Senate - so the United States has not yet committed itself to any legally binding goals.
Obama had said earlier he would be in Oslo, Norway, to accept his Nobel Peace Prize on December 10, but had not confirmed he would go to the United Nations Climate Change Conference, which runs from December 7 to 18.
He will go to Copenhagen the day before he goes to Oslo, the White House said.
Greenpeace criticized Obama's decision to go at the beginning of the conference rather than the end.
"The Copenhagen climate summit is not about a photo opportunity, it's about getting a global agreement to stop climate chaos. President Obama needs to be there at the same time as all the other wold leaders – December 18," Mike Townsley, spokesman for the environmental advocacy group, told CNN.
"This is when he is needed to get the right agreement. Again the right city, again the wrong date. It seems that he's just not taking this issue seriously," Townsley said.
–CNN's Paul Steinhauser, Jill Dougherty, Lisa Desjardins and Hilary
Whiteman contributed to this report.