Given the popularity of such recent books as Britt Wray’s “Rise of the Necrofauna” and Beth Shapiro’s “How to Clone a Mammoth,” as well as the publication of the most recent addition to the still growing body of literature taking the topic as its subject, Ben Minteer’s “The Fall of the Wild,” it shouldn’t be surprising that Intelligence Squared U.S. gathered together four people with quite different views on the matter for one of their Oxford-style debates.