As capitalist society remains incapable of addressing climate breakdown, one measure is waiting in the wings: solar geoengineering. No other technology can cut global temperatures immediately. It would alleviate the symptoms of the crisis, not its causes. But might it be combined with radical emissions cuts? This essay, the final instalment of two, subjects geoengineering to a materialist psychoanalysis and argues that it represents a fantasy of repression, setting itself up for a dreadful return of the repressed.