We're not advocating backing up a van of cheetahs and letting them go near Tucson.

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Obviously, gaining public acceptance is going to be a huge issue, especially when you talk about reintroducing predators. There are going to have to be some major attitude shifts. That includes realizing predation is a natural role, and that people are going to have to take precautions.

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Lions eat people. There has to be a pretty serious attitude shift on how you view predators.

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Humans will continue to change ecosystems, cause extinctions, and affect the very future of evolution -- either by default or design. The default scenario will surely include ever more pests and weed-dominated landscapes and the extinction of most large vertebrates.

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