Tim Lenton is Professor and Chair in Climate Change/Earth Systems Science at the University of Exeter, UK. He built a simple coupled carbon cycle and climate model, and coordinated the development of the GENIE family of Earth system models. He co-authored “Revolutions that made the Earth” (2011) with Andrew Watson. He and his group at the University of Exeter are focusing on understanding key events in the coupled evolution of life and the planet and on early warning of climate tipping points. They are developing an evolutionary model of the marine ecosystem. Tim is a Fellow of the Linnean Society and a Fellow of the Geological Society.