On July 14, 2011, at TomDispatch , Bill McKibben wrote that he and a few other “veteran environmentalists” had issued a call for activists to descend on the White House and “risk arrest to demand something simple and concrete from President Obama: that he refuse to grant a license for Keystone XL, a new pipeline from Alberta to the Gulf of Mexico that would vastly increase the flow of tar sands oil through the U.S., ensuring that the exploitation of Alberta’s tar sands will only increase.” It must have seemed like a long shot at the time, but McKibben urged the prospective demonstrators on, pointing out that “Alberta’s tar sands are the continent’s biggest carbon bomb,” especially “dirty” to produce and burn in terms of the release of carbon dioxide and so the heating of the planet. Just over four years later, the president, whose administration recently green-lighted Shell […]