Christiana Figueres was the UN Executive Secretary for Climate Change between 2010 and 2016. She was the public face of the most pivotal climate agreement in history, the Paris Climate Agreement, in 2015.

Tom Rivett-Carnac was senior political strategist for the Paris Agreement. Together they are the co-founders of Global Optimism, an organisation focused on creating environmental and social change, and co-hosts of the podcast Outrage and Optimism.