President Obama stood up to Big Oil and its puppets in Congress and denied a permit for the Keystone XL tar sands pipeline yesterday. This is encouraging news for the communities whose air and water would have been directly threatened by this pipeline, from Canada to Nebraska to the Gulf Coast. And it's an important piece of the struggle to avert a runaway climate catastrophe. But since the Keystone XL has become a pitched political battle, this announcement is also an encouraging affirmation of the power of people, creative protest, and grassroots organizing in the face of the entrenched power and big bucks of the oil industry.