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- 1974—The institute was founded by Lester Brown.
- 1975—The first Worldwatch Paper was published.
- 1984—First State of the World published.
- 1988—World Watch Magazine was launched.
- 1992—Vital Signs, Worldwatch's third annual series, was started.
- 2000—Christopher Flavin became President of Worldwatch in October.
- 2008—Worldwatch hosted the 20th Anniversary of the James E. Hansen hearings.