A substantial literature explains the adoption of climate change acts and their impact on climate policy once adopted. In contrast, we know very little about the processes leading to the non-adoption of climate change acts and the subsequent consequences for climate policymaking. This contribution aims at filling this gap by analysing the non-adoption of the Belgian bill for a climate change law. Proposed in February 2019, the Belgian bill for a climate change law was debated but then rejected very soon after, at the end of March 2019. Taking the non-adoption of the Belgian bill on climate change as an enlightening case study, this contribution investigates the impact of climate change act non-adoption on climate policies by: (i) questioning how climate change acts are drafted, and the role of academic experts for such a task in a context of climate emergency; (ii) analysing the reception and discussion of the bill on climate action, including within civil society; and (iii) tracing the follow-up actions ...