Thousands of people concerned about climate change descended on Washington, D.C., on Sunday.Organisers claim more than 35,000 attendees.
"Today was one of the best days of my life, because I saw the movement come together finally, big and diverse and gorgeous," 350.org President Bill McKibben tweeted after speaking at the rally.
The Keystone XL pipeline which would bring so-called tar sands oil from Canada into the United States is regarded as such a serious issue in climate terms because it has the ability to create the tipping point. In order to be built this TransCanada project has a legal hurdle it must pass - U.S. law requires federal approval for new pipelines crossing international borders, making the pipeline more vulnerable to concentrated political pressure.
Sierra Club's director Michael Brune was arrested at a Wednesday protest outside the White House.
Picture from The Nation