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• Al, Stefan
• Alan Rabinowitz
• Annin, Peter
• Barton, Andrew M
• Boal/ Dykstra
• Bohan
• Bruntlett/ Bruntlett
• Cervero/ Guerra
• Cristina Eisenberg
• Daniel Pauly
• Darrin Nordahl
• Eise/ Foster
• Emily Monosson
• Fleck, John
• Forster O. Ndubisi
• Frederick Steiner; Foreword by Richard T.T. Forman
• Gillam
• Imhoff, Daniel
• Joe Landsberg and Richard Waring
• John Davis
• Karen Firehock
• Kiesecker/ Naugle
• Landis
• Langdon
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• Mancuso, Stefano
• Margaret A. Palmer, Joy B. Zedler, and Donald A. Falk
• Mark Jerome Walters
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• Robert I. McDonald
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• Speck, Jeff
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• Steven I. Apfelbaum and Alan Haney
• The Worldwatch Institute
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• Wilson, Edward O.
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• Yoram Bauman and Grady Klein