Nigel Purvis is the founder, President and CEO of Climate Advisers, a Washington, DCbased consultancy specializing in U.S. climate change policy, international climate change cooperation, global carbon markets, and climate-related forest conservation. The firm’s clients include philanthropic foundations, think tanks, environmental groups, governments, international organizations, companies and financial institutions. Nigel directed U.S. environmental diplomacy in the William J. Clinton and George W. Bush administrations, most recently as Deputy Assistant Secretary of State for Oceans, Environment, and Science.