Those scientists in favour of geo-engineering climate change solutions seem to be broadly taking the view that, since we are incapable of actually reducing our CO2 emissions, we ought to at least consider any other options to mitigate the problem, and fund some serious research into "sticking plasters". The recent article (available to download from Frontiers in Science) points out that all of the proposals up to now are pretty much infeasible at the scale required, and would likely cause more harm than good, both environmentally, and politically.
Essentially if we want to fix this it needs to be addressed at source, in other words our CO2 emissions, which sadly isn't likely to happen any time soon. It's all too easy for the bulk of folks just to ignore, deny or be apathetic to the problem.