Moving Rio forward and avoiding 10 more years with little evidence for effective conservation policy.

BRENDAN FISHER,∗†‡‡ ANDREW BALMFORD,‡ PAUL J. FERRARO,§ LOUISE GLEW,∗ MICHAEL MASCIA,∗ ROBIN NAIDOO,∗ AND TAYLOR H. RICKETTS∗∗ ∗Conservation Science Program, World Wildlife Fund-US, Washington, DC 20037, U.S.A. †Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ 08544, U.S.A. ‡Department of Zoology, Conservation Science Group, University of Cambridge, Cambridge CB2 3EJ, United Kingdom §Department of Economics, Andrew Young School of Policy Studies, Georgia State University, Atlanta, GA 30302, U.S.A. ∗∗Rubenstein School of Environment and Natural Resources, Gund Institute for Ecological Economics, University of Vermont, Burlington, VT 05401, U.S.A.