"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."
"We must realize that we're all part of a web of life around the world. Anytime you extinguish a species, the consequences are serious."
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Source: Gaylord Nelson, Susan M. Campbell, Paul A. Wozniak (2002). “Beyond Earth Day: Fulfilling the Promise”, p.18, Univ of Wisconsin Press
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