Climate change is a product of the entire social and economic system within which we exist, in a word, capitalism. Challenging capitalism is essential to challenging climate change. We have difficult issues to consider: *How can we promote political action to end capitalism, and do so quickly? *How can individuals be mobilised to act? *What can we do now, to at least slow rising emissions? We need to build bases, as stepping-stones connected to a broader project creating capacity for a sustainable society.