When contestation legitimizes: the norm of climate change action and the US contesting the Paris Agreement

In 2017 US president Trump announced the intent to withdraw from the Paris Agreement. This was widely perceived as a major challenge to continued cooperation to counter climate change. A feared consequence was further member withdrawal leading to the weakening of the Paris agreement and thus, the climate change action norm. Yet instead, states and non-state actors recommitted to the agreement and further legitimated the norm. How did this contestation of the US withdrawal announcement contribute to the further legitimation of the climate change action norm? I argue that this is due to climate change action being established as a legitimate, institutionalized norm within a diverse community in the global climate regime, especially by the UNFCCC's effort. Contestation and legitimation are connected in a holistic process. Trump's contestation therefore triggered legitimation rather than de-legitimation. Based on 26 interviews with UNFCCC officials, COP negotiators and non-state actors, I show that the announcement can be perceived as catalyst to the norm legitimation. This article contributes to the literature on the legitimation and contestation of norms, especially those facilitated by international organizations in the global climate regime.