"The ultimate test of a man's conscience may be his willingness to sacrifice something today for future generations whose words of thanks will not be heard."
"Dr. S. Dillon Ripley, secretary of the Smithsonian Institute, believes that in 25 years, somewhere between 75 and 80 percent of all the species of living animals will be extinct."
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Source: Gaylord Nelson, Paul A. Wozniak, Susan M. Campbell (2002). “Beyond Earth Day: Fulfilling the Promise”, p.164, Univ of Wisconsin Press
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