James Kanter, Andrew C. Revkin: World Scientists Near Consensus on Warming. In: The New York Times. 2007 (nytimes.com).
openlibrary.org
Paul R. Ehrlich, Anne H. Ehrlich, John P. Holdren: Ecoscience: Population, Resources, Environment. W. H. Freeman, San Francisco, 1977 (openlibrary.org).