"Some experts call Pleistocene Park a watershed in efforts to study lost ecosystems. 'It's a very exciting idea,' says Martin.... 'It makes sense to reintroduce species that have been recently extirpated by human hunting or habitat encroachment,' says Paul Koch, a specialist on Pleistocene mammals at the University of California, Santa Cruz. 'It's just planetary hygiene.'"
—Richard Stone, Mammoth: The Resurrection of an Ice Age Giant (Cambridge, Mass.: Perseus Publishing, 2001), 180