Dr. Greg Flato is the Acting Director - Climate Research Division within Environment and Climate Change Canada. He has spent his career in the development of global climate models to simulate historical variations and project future climate change. He has been involved in a number of Intergovernmental Panel on Climate Change (IPCC) cycles as author, and most recently was elected Vice-Chair of the IPCC's Working Group I. Greg joins to discuss the latest in climate modelling and earth system modelling, and the role that these models have in informing policy decisions at national, state, and local levels.