For environmentalists dedicated to killing it, President Barack Obama’s rejection of the proposed Keystone XL pipeline unleashed a moment of euphoria. Activists celebrated with tequila shots at Sierra Club headquarters in San Francisco and in Lafayette Square across from the White House, site of the first anti-Keystone protests in 2011, when to most people it was just another pipeline. But last Friday’s presidential “no” to the 1,200-mile (1931 km) pipeline out of Alberta’s oil sands may signal more than just a single, if remarkable, win for environmentalists. It stands to sharpen the fissure in the green movement between those who believe direct action can jar the world off its fossil fuel habit, and others who say only a collaborative approach that engages governments and corporations can […]