Matthew T. Huber argues that the carbon-intensive capitalist class must be confronted with its disproportionate effect on the climate. Yet, at present the climate movement is unpopular and rooted in the professional class, where it remains incapable of meeting this dizzying challenge. As an alternative, Huber proposes a climate politics to appeal to the majority—the working class—and he evaluates the Green New Deal as a first attempt to channel working-class material and ecological interests. He advocates building union power in the very energy system that must be transformed. In the end, winning the climate struggle will require an internationalist approach based on planetary working-class solidarity.