A stratospheric veil against the sun; the cultivation of photosynthetic plankton;
fleets of unmanned ships seeding clouds:
these are the radical technologies of climate geoengineering,
proposed by a small but increasingly influential group of scientists
to combat the effects of global warming.
It is chilling to think of such power, and such scope for misadventure or malice, in human hands.
And yet we’re now at the point where we have no choice but to take them very seriously indeed.