As Chair of the Intergovernmental Panel on Climate Change, Dr Hoesung Lee leads efforts to provide policymakers with the science they need to save the planet. He will be in conversation with the BBC’s Science Correspondent, Pallab Ghosh, discussing whether it is now time to consider radical transformations in society and the economy and controversial climate repair schemes to take greenhouse gasses out of the atmosphere. The IPCC has warned that a step change in thinking will be needed if we are to avoid irreversible environmental damage to our world. The next cycle of the panel’s scientific assessments will focus on finding solutions to the impact of global warming caused by human activities. This session is an opportunity to listen to Dr Lee talk about two special reports: one on land use and other the oceans due to be published in the coming weeks.