Obama's speech to the Copenhagen climate summit
US president addresses the UNFCCC Climate summit on 18th Dec 2009 i.e., on the final day of the talks.
He believes that it's time for the nations and people of the world to come together behind a common purpose. And must choose action over inaction; the future over the past and meet responsibility to the people, and to the future of the planet.
For full speech: http://www.guardian.co.uk/environment/2009/dec/18/obama-speech-copenhagen-climate-summit