ARLINGTON, Va. — Peter Kareiva had come to answer for his truths. Settling at the head of a long table ringed by young researchers new to the policy world, Kareiva, chief scientist of the Nature Conservancy, the world’s largest environmental organization, cracked open a beer. After a long day mentoring at the group’s headquarters, an eight-story box nestled in the Washington, D.C., suburbs, he was ready for some sparring.
The scientists had read Kareiva’s recent essay,….
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