"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."
"If we continue to address the issue of the environment where we live as though we're the only species that lives here, we'll create a disaster for ourselves"
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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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