America’s defence department is looking for rogue geoengineers

WHAT IF a country experiencing the bad effects of climate change—crop failures, perhaps, or serious flooding—were to begin, unilaterally and perhaps quietly, to try to modify the climate? Such a project, reckons DARPA, a research arm of America’s defence department, is possible. But it could trigger chaos, and not just of the meteorological sort. The agency, the overall objectives of which include preventing “strategic surprise”, has therefore recently begun to pay for research into how such an event might happen, and how to react to it.