| 2001 | Caitlin Peterson, Vivek Sandell, and Dr. Andrew Lawlor
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| July, 2001 | Yacine Khelladi
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| August, 2003 | Jennifer Reck and Brad Wood |
| December, 2002 | Samantha Putt del Pino, Pankaj Bhatia |
| April, 1986 | A report by the World resources Institute and the International Institute for Environment and Development
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| April, 1987 | International Institute for Environment and Development and World Resources Institute
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| January, 1988 | WRI, IIED, UNEP
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| July, 1990 | World Resources Institute, in collaboration with the United Nations Environment Programme and the United Nations ... |
| March, 1992 | World Resources Institute in collaboration with the United Nations Environment Programme and the United Nations ... |
| March, 1994 | World Resources Institute in collaboration with the United Nations Environment Programe and the United Nations ... |