"To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science."

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The end of nature sours all my material pleasures. The prospect of living in a genetically engineered world sickens me. And yet it is toward such a world that our belief in endless material advancement hurries us. As long as that desire drives us, here is no way to set limits.

— Bill McKibben