My gut feeling is that geoengineering has to happen. It's like trying to get rich by saving pennies here and there (cutting emissions) vs investing in a successful business (geoengineering).

I mean, we can cut and cut emissions but doesn't that just delay the inevitable (assuming continued population growth)? Plus getting everyone to change their behaviour is a nice goal but at some point we'll need to admit it probably isn't possible to create the behaviour changes needed to stop a catastrophe (human nature and long-term thinking being what it is).