"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."
"Trails are relatively inexpensive. A splendid national network of all kinds of trails can be established at less cost than a few hundred miles of super highway."
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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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