[ZachS]

I'd personally much rather see the source of the problem fixed (reduce carbon emissions). I also hope this doesn't turn into an excuse to clear-cut more rain forests.

i.e. We'll cut down the real trees and replace them with efficient carbon collecting "tree" buildings.

[netsp]

I think that for the most part, it is expected that some sort of geo-engineering (call it what you like) will take place.