This is interesting in comparison to the proposals for terraforming other planets. We are going to engineer Mars so we can live there, and maybe the moon, too. Yet, we are wound around the axle about doing the simplest things to our home planet. We are not at the point of controlling our base climate, or distrubuting fresh water, or even keeping the dust down, or even deciding if we need to. Is there any serious hope that we have a destiny of our own choosing?
This has nothing to do with whether we can do it. We can halt all industrial 'greenhouse' emissions overnight if we want to. The debate is completely and entirely over whether the benefits are worth the investment.
Should we deem fit to do so, we can make dramatic alterations to our base climate.