From L-R: Luis Gomez Echeverri, Emeritus Research Scholar, International Institute for Applied Systems Analysis (IIASA); Diana Ürge-Vorsatz, Vice-Chair, IPCC, and Director, Center for Climate Change and Sustainable Energy Policy (3CSEP); Ma Jun, Director, Institute of Public and Environmental Affairs (IPE), China; and Mercedes Bustamante, Professor, University of Brasilia, Brazil