Nothing else in the world… not all the armies…  is so powerful as an idea whose time has come.

                                                           — Victor Hugo

Last night I got to see Bill McKibben deliver a typically rousing and depressing speech in his hometown and the home of the American Revolution, Lexington, Massachusetts. McKibben is one of very few leading lights building a global climate movement up to the task of preventing an all-out climate catastrophe. I credit McKibben more than any other single person with pushing those concerned about climate change to take meaningful collective action. So I was a little nervous when I got to ask him a question from the audience about something I find troubling about his approach.

Early in his talk, McKibben pointed out that the number 350 — equal to the maximum safe level of greenhouse gases in our atmosphere — was entirely non-ideological. He went on to suggest that we can build a movement that can shame and pressure our elected officials to act to price carbon high enough that we begin to phase out our devastating use of fossil fuels. Missing from this approach, however, is McKibben’s own analysis that the paradigm of economic growth is an underlying cause of the climate crisis. While McKibben was clearly embracing the task at hand as a political one, he seemed excruciatingly timid about the fact that the political task at hand is an ideological one.