To arms! The narrative of radical environmentalism is changing dramatically, with activists now fixated on a Climate War as their preferred outcome. Mass mobilization, war-time rationing, a command-and-control economy. All are now invoked as essential to dealing with our ‘climate emergency.’ And the inevitable foe in this conflict is capitalism. As economic specialist Matthew Lau points out, however, what the environmental war party overlooks is the central role played by free markets in driving change, resolving conflict and improving the human condition.