While we were talking, a friend of Schrag’s showed up at his office. Schrag introduced her as Allison Macfarlane, a professor at George Washington University and a former head of the U.S. Nuclear Regulatory Commission. When he told her we were discussing geoengineering, she made a thumbs-down gesture. “It’s the unintended consequences,” she said. “You think you’re doing the right thing. From what you know of the natural world, it should work. But then you do it and it completely backfires and something else happens.” “The real world of climate change is that we’re up against it,” Schrag
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