The final lecture in the series entitled Climate Connections was presented by Dr Myles Allen who currently heads the Climate Dynamics Group in the Department of Physics, University of Oxford. Dr. Allen's latest research addresses the question of how scientific evidence can best be used to inform climate policy. His work has shown that limiting cumulative emissions of carbon dioxide may be a more robust approach to climate change mitigation policy than attempting to define a 'safe' stabilization level for atmospheric greenhouse gases.