Green campaigning today is totally unsuited to political and economic realities. Where is the vision in environmental radicalism? Only by thinking very big will we save the world. It’s natural to see US inaction on climate change as another symptom of our broken politics. The United Nations’ climate change panel has announced the world needs major US emissions controls on greenhouse gases to avoid global catastrophe. It didn’t happen when the Democrats controlled Congress, and it isn’t any more likely in this Congress, which is well stocked with climate-change deniers. That isn’t the whole story, though. The whole story is...