Are we prepared for geoengineering?

A UK government agency recently announced it would spend £57 million on a controversial project to develop geoengineering technologies. The Exploring Climate Cooling Programme will fund 21 international research teams to conduct small-scale, controlled outdoor experiments to thicken Arctic sea ice and brighten clouds, to prevent global warming from increasing past irreversible tipping points. Geoengineering has long been a point of contention amongst scientists, environment...