A Breakthrough in Copenhagen

President Obama attends the United Nations Climate Change Conference in Copenhagen, Denmark, Dec. 18, 2009.

President Barack Obama walks with Senior Advisor Valerie Jarrett during the United Nations Climate Change Conference at the Bella Center in Copenhagen, Denmark, December 18, 2009.

1 of 10

play

next photo

The 2014 White House Easter Egg Roll April 21, 2014	The Seventh Annual Wounded Warrior Project's Soldier Ride April 17, 2014	April 2014: Photo of the Day April 1, 2014	The President's Trip to Europe and Saudi Arabia March 30, 2014
The First Lady Visits China March 27, 2014	President Obama Awards the Medal of Honor to 24 Army Veterans March 18, 2014	The Vice President and Dr. Biden's Trip to Chile March 13, 2014	March 2014: Photo of the Day March 4, 2014