Sierra Club Executive Director Michael Brune is arrested outside the White House in Washington, Wednesday, Feb. 13, 2013, as prominent environmental leaders tied themselves to the White House gate to protest the Keystone XL oil pipeline.. (AP Photo/Ann Heisenfelt)

Associated Press
Sierra Club Executive Director Michael Brune is arrested outside the White House in Washington, Wednesday, Feb. 13, 2013, as prominent environmental leaders tied themselves to the White House gate to protest the Keystone XL oil pipeline..  (AP Photo/Ann Heisenfelt)
Sierra Club Executive Director Michael Brune is arrested outside the White House in Washington, Wednesday, Feb. 13, 2013, as prominent environmental leaders tied themselves to the White House gate to protest the Keystone XL oil pipeline.. (AP Photo/Ann Heisenfelt)
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