This week's episode features ecologist and Greenpeace co-founder, Dr Patrick Moore. Patrick explains how he became involved in founding a multi-national environmental organisation which fought for the end of nuclear bomb testing and whale hunting, before being hijacked by non-scientific interests intent on banning everything from chlorine to PVC. Jonathan opens up discussion on the climate change the Earth has experienced over several billions of years, and Roman queries the role carbon dioxide is playing in this process. Dr Moore discusses the so-called 97% consensus on climate change, the Paris agreement, and the politicisation of the green movement.