That beings said (though, I am CERTAINLY no proponent of this idea), were we to make this geostable "sunshade" out of some sort of solar power generation device (since all of this is ridiculous conjecture, I don't have to think about the logistics) it could cool the (already) elevated global temperatures while reducing green house gas emissions. Though, that would create it's own long term issues to be solved, but all of these fanciful odeas tend towards band-aids, instead of solutions =) still, fun thought experiments