Matt Ridley
Donella H. Meadows
Paul R. Ehrlich
Thomas Robert Malthus
Vaclav Smil
Tertius Chandler
United States. General Accounting Office
Adna Ferrin Weber
Dennis Hume Wrong
S. N. Agarwala
John Allen
Robert C. Cook
Steven W. Mosher
Clark, Colin
Joanne E. Holler
Kuan-I Chen
Georg Borgstrom