PHOTOS: ‘Cowboy & Indian Alliance’ in an Earth Day Protest Against the Keystone XL Pipeline

Native American tribal leaders host a traditional opening ceremony to begin a horseback ride as part of a demonstration against the proposed Keystone XL pipeline at the U.S. Capitol Reflecting Pool on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Getty)