See

• Cooling the Earth: CO2, SO2, and The Sunscreen Fix by technopolitical on October 16th, 2006
  
• Making Sustainability Simple by nanne on December 11th, 2007
  
• Geoengineering: basic principles, some thoughts, some questions by a siegel on March 6th, 2008
  
• LQD: Geoengineering Ranked by nanne on November 21st, 2008
  

En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma

No.

Based on what I have seen of the different climate models, introduction of new factors in the models will have rather different outcomes. We are dealing with equilibriums and feedback-loops and barely begun to grasp the systems boundaries. We can try to re-create known conditions (by say removing carbon dioxide from the air), but if we in the process increase other factors we do not know the effect, other then that there is in all probability limits where the new factors will cause unwanted effects.

A vote for PES is a vote for EPP! A vote for EPP is a vote for PES! Support the coalition, vote EPP-PES in 2009!

No.

But the point is that we're already doing it, accidentally.

And the rest of the point is to stop.

But Lovelock is hitching his wagon to a libertarian zeitgeistish point of view which suggests that things left alone without (government) intervention naturally return to happy equilibrium.

Which is bollocks, and should be called out as such.

No, but we don't know enough to get climate change right either: I'm comfortable with the idea that pumping loads of crap likely to increase the energy of the system into the atmosphere is probably a really, really bad idea but I could be wrong. Maybe it's all that's kept us out of a sudden ice age. I'm certainly not comfortable with the idea that any of our climate predictions are likely to be long-term accurate.

I'd like to see geoengineering limited to stuff we can reverse - like big reflectors in space to reduce the energy of the sun reaching the surface, so that we can undo what we did, but we won't be able to predict the outcome at all without putting a lot of money and effort into climate and systems science.