In pictures: Climate activists form 'human oil spill' in front of White House
Hundreds arrested in civil disobedience action calling on Obama to reject Keystone pipeline
Demonstrators strapped to the White House fence in Washington chant during a protest against the proposed Keystone XL oil pipeline, Sunday, March 2, 2014. They were later arrested.Manuel Balce Ceneta/The Associated Press
Protestors are strapped to the White House fence in Washington, chanting during a protest against the proposed Keystone XL oil pipeline, Sunday, March 2, 2014. They say the pipeline will contribute to global warming.Manuel Balce Ceneta/The Associated Press
Protestors are strapped to the White House fence in Washington, during a protest against the proposed Keystone XL oil pipeline, Sunday, March 2, 2014.Manuel Balce Ceneta/The Associated Press
Kevin Jensen, right, with Mackenzie Gray, left, of Florida, flashes a heart sign during a protest against the proposed Keystone XL oil pipeline in front of the White House in Washington, Sunday, March 2, 2014.Manuel Balce Ceneta/The Associated Press
Several hundred students and youth who marched from Georgetown University to the White House to protest the Keystone XL Pipeline are arrested outside the White House in Washington, Sunday, March 2, 2014.Susan Walsh/The Associated Press
Several hundred students and youth who marched from Georgetown University to the White House to protest the Keystone XL Pipeline wait to be arrested outside the White House in Washington, Sunday, March 2, 2014.Susan Walsh/The Associated Press
Several hundred students and youth who marched from Georgetown University to the White House to protest the Keystone XL Pipeline are arrested outside the White House in Washington, Sunday, March 2, 2014.Susan Walsh/The Associated Press
People protest against the Keystone XL Pipeline outside the White House in Washington, Sunday, March 2, 2014.Susan Walsh/The Associated Press