IMHO the big elephant in the room is that global warming is just one of the large environmental problems we're facing. There's also eg overfishing, deforestation, ocean acidification.

So even if we could "fix" global warming through geoengineering (and from all that I've read, signs point to no), there are still so many other problems that the only way not to mess up the planet completely is to change our habits and consume fewer resources.

You may now begin complaining about how the fact that the world is not infinitely bountiful impinges on your rights.