Independent: Two years ago this month, in a disused UK airfield, scientists were preparing to undertake one of the more controversial experiments in history. A dirigible balloon would spray 120litres of water droplets into the sky, a miniaturized test for a larger system that would pump out chemical particles to reflect sunlight and, so the scientists hoped, cool the planet. It was to be amomentous day.
Geoengineering is the largescale, technological manipulation of the climate (some call it "planet hacking")....