Does the climate challenge justify degrowth?

Résumé

Degrowth is often advocated as a response to the climate crisis, but its consistency with growth theory remains unclear. We develop an endogenous growth model of directed technical change and climate in which the economy relies on both a polluting fossil resource and a clean renewable alternative. We fully characterize the social optimum and show that accounting for climate damages may justify an initial phase of degrowth. Such a phase is more likely when fossil resources are abundant and fossil-oriented research is relatively inefficient. In all cases, long-run optimal growth remains positive.

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Référence

André Grimaud, Gilles Lafforgue et Luc Rougé, « Does the climate challenge justify degrowth? », TSE Working Paper, n° 26-1748, mai 2026.