Obama and Hollande Arrive at Opening of UN Climate Summit Near Paris

U.S. President Barack Obama (R) is greeted by French President Francois Hollande at the United Nation's 21st climate change conference at Le Bourget near Paris on November 30, 2015. The almost 150 heads of state and representatives from 200 countries in attendance will attempt to negotiate a legally binding agreement to limit worldwide carbon emissions with the goal of keeping global warming under 2 degrees Celsius. Photo by David Silpa/UPI