John Holdren, Director, Woods Hole Research Center; Theresa and John Heinz Professor of Environmental Policy; Director of the Program on Science, Technology, and Public Policy, the Kennedy School, Harvard University No one nation can effectively reverse the growing problems caused by our changing climate. Coordinated global efforts - between governments, corporations, and individuals - can help us conserve and develop energy resources, as well as ensure the continued growth of emerging and developed nations. What can political leaders do? What can businesses and investors do? And what can you do?