Today, Al Gore was awarded the Nobel Peace Prize for raising awareness around the world about the threat of global warming.
Here's what Barack Obama had to say:
By having the courage to challenge the skeptics in Washington and lead on the climate crisis facing our planet, Al Gore has advanced the cause of peace and richly deserves this reward. His voice and his vision have awakened the conscience of America to the urgency of this threat, and now we must take bold action so that our children inherit a planet that is cleaner, safer, and more peaceful for generations to come.