"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."
"The most important environmental issue is one that is rarely mentioned, and that is the lack of a conservation ethic in our culture."
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Source: Gaylord Nelson, Paul A. Wozniak, Susan M. Campbell (2002). “Beyond Earth Day: Fulfilling the Promise”, p.157, Univ of Wisconsin Press
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