Rachel Warren is Professor of Global Change and Environmental Biology at the Tyndall Centre for Climate Change Research, University of East Anglia, UK. Her research focuses on the production of policy relevant science related to climate change and sustainability. A particular recent focus has been the quantification of the climate change impacts that can be avoided by timely mitigation of greenhouse gas emissions, in particular in relation to risks to biodiversity. She was a coordinating lead author of the 5th (2014) assessment of the Intergovernmental Panel on Climate Change (IPCC), and lead author of the 4th assessment. Presently she is a lead author of the IPCC’s Special Report on 1.5°C warming. She has produced over 80 peer reviewed publications and over 40 scientific reports to government departments.