Plan B for climate change

IF WE can’t reduce emissions enough, what else can cool the planet? We need to find out if geoengineering works, and soon, say a group of atmospheric scientists.

Engineering the planet’s weather and climate is a highly controversial idea. That’s why we need experiments, the group say, and they want the first to start in two years’ time. The frontrunners are schemes to alter the atmosphere to reflect more of the sun’s rays back into space, or to change clouds so that they let more of Earth’s heat out instead of trapping it.