This article builds on scholarship that understands climate change not only as a geophysical phenomenon, but also as a complex idea. It argues for a historicised analysis of what it terms “climate pessimism”: the belief that catastrophic global heating cannot be prevented. Focusing especially on nonfictional texts by Jonathan Franzen and Roy Scranton, it suggests that climate pessimism draws on a Western intellectual tradition that takes a sceptical view of human capacities and the possibility of progress. At the same time, climate pessimism tends to evoke an idea of atomised human nature associated with capitalistic modernity. Franzen draws on ideas from evolutionary psychology in a rather simplistic way. Scranton, a more complex thinker, engages not only with Buddhist thought but also with the philosophies of Benedict Spinoza and Arthur Schopenhauer. Although often criticised as a “doomer”, he sometimes moves towards an epistemological pluralism and sense of human potentiality. The concluding section brings in the concept of the pluriverse as both a corrective to climate pessimism’s tendency to Westerncentrism, and a point of connection to Scranton’s work.