"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."
"I think the internal combustion engine will disappear from the streets of our cities in the next thirty years because transportation will be mass transportation, or probably electrical power."
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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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