Scientists have been warning about the dangers of climate change for decades, but with little success at convincing society to slow the rate of greenhouse gas emissions. Why? What is wrong with the conventional academic’s theory of change, that providing information to key stakeholders will enable more effective climate policymaking? These questions have been central to Dr Charlie Gardner’s career and development, and this conversation tracks his experiences moving from a leading Conservation Scientist in Madagascar working right on the frontier of biodiversity loss, through to being one of the leading figures in Scientist Rebellion. Edited by Aidan Knox.