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- British Broadcasting Corporation (18)
- Hoagland, Edward (16)
- World Bank (14)
- Heinrich, Bernd, 1940- (13)
- United Nations Development Programme (13)
- Matthiessen, Peter, 1927- (12)
- McKibben, Bill, 1960- (12)
- Austin, Mary Hunter, 1868-1934 (10)
- Ehrlich, Gretel (10)
- Intergovernmental Panel on Climate Change. Working Group 3 (9)
- Slovic, Scott, 1960- (9)
- Nabhan, Gary Paul (8)
- Olson, Sigurd F., 1899- (8)
- United Nations Environment Programme (8)
- Williams, Terry Tempest (8)
- Zwinger, Ann (8)
- Intergovernmental Panel on Climate Change (7)
- Intergovernmental Panel on Climate Change. Working Group 1 (7)
- Metz, Bert (7)
- Murphy, Patrick D., 1951- (7)
- Shiva, Vandana (7)
- Wilson, Edward Osborne, 1929- (7)
- Worster, Donald, 1941- (7)
- Boufford, David E. (6)
- Carr, Archie Fairly, 1909- (6)
- Finch, Robert, 1943- (6)
- Hubbell, Sue(1935-) (6)
- Jaeger, Edmund C. (6)
- Peattie, Donald Culross, 1898-1964 (6)
- Seton, Ernest Thompson, 1860-1946 (6)
- 大場, 秀章 (1943-) (6)
- 岩槻, 邦男 (1934-) (6)
- Balliett, James Fargo (5)
- Brown, Lester Russell, 1934- (5)
- Gunn, Angus M. (Angus Macleod), 1920- (5)
- Houghton, John Theodore, 1931- (5)
- Intergovernmental Panel on Climate Change Working Group II (5)
- Morton, Timothy, 1968- (5)
- Nash, Roderick, 1939- (5)
- Nelson, Richard K. (5)
- Solnit, Rebecca (5)
- Sperling, Marcos von (5)
- Adams, W. M. (William Mark), 1955- (4)
- Attenborough, David, 1926- (4)
- Byron, R. N. (Ronald Neil), 1950- (4)
- Camuto, Christopher (4)
- DeBlieu, Jan (4)
- Dillon, Justin (4)
- Glotfelty, Cheryll (4)
- Gore, Albert, 1948- (4)
- Guha, Ramachandra (4)
- Jaeger, Edmund Carroll, 1887- (4)
- Kittredge, William, 1932- (4)
- Lamb, H. H. (4)
- Mulvaney, Dustin (4)
- Organisation for Economic Co-operation and Development (4)
- Petrokofsky, Gillian (4)
- Pyle, Robert Michael (4)
- Quammen, David, 1948- (4)
- Reid, Alan, 1970- (4)
- Resources for the Future (4)
- Robb, Cairo A. R. (4)
- Sayer, Jeffrey (4)
- Spash, Clive L. (4)
- Steingraber, Sandra (4)
- Tchobanoglous, George (4)
- Teale, Edwin Way, 1899- (4)
- Adamson, Joni, 1958- (3)
- American Water Works Association (3)
- Archer, David, 1960- (3)
- BBC Active (3)
- Belasco, Warren James (3)
- Buell, Lawrence (3)
- Collin, Robert William (3)
- Collin, Robin Morris (3)
- Cronon, William (3)
- DeLoughrey, Elizabeth M., 1967- (3)
- Dobrin, Sidney I. (3)
- Dobson, Andrew (3)
- Elliott, David (3)
- Estok, Simon C. (3)
- Garrard, Greg (3)
- Garrity, George M. (3)
- Gerba, Charles P., 1945- (3)
- Gifford, Terry (3)
- Goodall, Jane, 1934- (3)
- Handley, George B., 1964- (3)
- Harrison, Roy M., 1948- (3)
- Hester, R. E. (Ronald E.) (3)
- Hubbell, Liddy (3)
- Johansen, Bruce E. (Bruce Elliott), 1950- (3)
- Kouba, Leslie (3)
- Kraft, Michael E. (3)
- Matthiessen, Peter (3)
- McKibben, Bill (3)
- McNeill, John Robert (3)
- Merian, E. (3)
- Montgomery, David R. (3)
- Oppermann, Serpil (3)
- Quammen, David (3)