Geoengineering is just a gamble corporations want the world to take on their behalf. There's a chance that doing it would fuck things up way worse than they are now, but there's also a chance that it makes things a little better and if that happens it will reduce the pressure on those corporations to make the changes we already know with 100% certainty would improve things, but which would also directly eat into their profits. They're willing to risk screwing over the planet and/or large populations just to keep business as usual and profits sky high for a little longer when we all know that it was their irresponsible and clearly unsustainable practices that caused this mess in the first place and any success geoengineering might have would still only delay the inevitable changes to their business practices that need to be made. I don't blame people for not wanting to roll the dice just so that corporations can rape and pillage a little longer.