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The official motion for the night, "Don't Bring Extinct Creatures Back to Life," was chosen by Intelligence Squared, a nonprofit that turns academic-level debates into popular live events and podcasts. Arguing for the motion were Lynn Rothschild, a scientist with NASA, and Ross MacPhee, a curator at the American Museum of Natural History in New York City. The two were also arguing against Church and Brand. Genetic Rescue Brand started by saying controversy around de-extinction is "made up." He wasn't saying they should resurrect meat-eating dinosaurs. Instead, he said, de-extinction could be achieved through hybrids, or animals created from living, endangered species and extinct ones, using CRISPR. The term is an acronym for a tool that has been likened to "playing God" because it allows scientists to remove and replace genes. Eventually, CRISPR could be used to boost agricultural production or to replace wildlife that's slowly disappearing. That is the goal of the Revive & Restore project, a California nonprofit co-founded by Brand that seeks to use new methods of "genetic rescue for endangered and extinct species." The group is working to reintroduce the extinct passenger pigeon into the wild. The process would remove genes from modern band-tailed pigeons and replace them with passenger-pigeon genes. Revive & Restore would like to do something similar with woolly mammoths, editing the extinct creature's genes into those of modern Asian elephants. In that case, the goal is t