This is a case where it is important to differentiate global warming from the general. Blocking out the sun can help with temperature, but it doesn't help with ocean acidification and other issues.
Still, it may be better to do something to slow down rising temps and oceans and then deal with the acidification and similar problems later. This gets at the nub of the moral hazard issue with blocking the sun though. If it seems to work for temperature, will people just kick the can down the road and let the oceans acidify?
