I thank symposium organizers J. C. Avise and F. J. Ayala for the invitation to contribute. E. J. Sterling, T. E. Lovejoy, G. Amato, M. A. O'Leary, L. J. Guggenheim, E. V. Futter, J. Cracraft, E. O. Wilson, and P. H. Raven shared insights and comments that influenced the development of this chapter. I thank J. C. Avise, J. B. C. Jackson, and an anonymous reviewer for constructive criticisms and comments.

NOTE: A 2008 Gallup Poll shows that more Americans than ever recognize that the effects of global warming may have already begun but are not as concerned about this as they are other problems, including the pollution of drinking water (Newport, 2008).

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