Geoengineering could save the ice sheets – but only if we start soon

Shading Earth’s surface from sunlight could postpone or even avoid the collapse of the West Antarctic ice sheet – but only if we start soon and only in conjunction with substantial emissions cuts, according to two computer modelling studies by independent teams.

“There’s a time window that we can do this, and if we dither, there’s just no point in doing it,” says John Moore at the University of Lapland in Finland, who led…