Cosmos: A plan to inject sulphate aerosols into the stratosphere, as a quick fix to counteract global warming, may drastically increase Arctic ozone depletion and slow the recovery of the Antarctic ozone hole, researchers warn. A number of ‘geoengineering’ schemes have been proposed in recent years as possible ways for us to deflect the Sun’s heat or reduce the amount of carbon dioxide in the atmosphere. Infeasible and costly Examples include positioning giant mirrors in orbit …