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 focus has been the quantification of the climate change risks that can be avoided by timely mitigation of greenhouse gas emissions, including the risks of biodiversity loss. Rachel works closely with the UK Department of Business, Energy and Industrial Strategy and the UK Climate Change Committee. She was a coordinating lead author of the 5th (2014) assessment of the Intergovernmental Panel on Climate Change (IPCC), lead author in the 4th and 6th assessments and also the recent Special Report on 1.5°C warming.