Just how bad is China’s air pollution? A recent M.I.T. study concluded that a huge swath of the Chinese population is losing an average of five years in life expectancy due to pollution. The Chinese government is getting serious about the issue, and not just because the thick smog actually interferes with domestic surveillance efforts. China’s pollution has become a source of national embarrassment and outrage, with Chinese scientists comparing it to a nuclear winter. The government is now escalating the use of drones to fight its recently declared “war on pollution.” In a plan reminiscent of the futuristic geo-engineering discussed at Techonomy 2012, aircraft disperse chemicals that freeze pollutants, making them fall to the ground. But what becomes of this solidified smog, not to mention the chemicals, once it’s been scrubbed from the sky?