This Scientist Has a Risky Plan to Cool Earth - solar geoengineering. There's Growing Interest.

[caraher]

9. The worst case scenario is probably having this work

This kind of geoengineering is basically an irreversible decision, because if you ever stop, all the elements of runaway greenhouse warming are still in place, and the effects on life will be even more catastrophic than doing nothing (because the rate of heating will be even greater).