"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."
"Our air, water, soil, forests, oceans, rivers, lakes, scenic beauty, wildlife habitat, minerals, that is the wealth of the country."
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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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