BBC: Schemes to tackle climate change could prove disastrous for billions of people, but might be required for the good of the planet, scientists say.
That is the conclusion of a new set of studies into what's become known as geo-engineering.
This is the so far unproven science of intervening in the climate to bring down temperatures.
These projects work by, for example, shading the Earth from the Sun or soaking up carbon dioxide.
Ideas include aircraft spraying out sulphur particles at high...