I’m fairly certain we will resort to this type of geo engineering soon - cutting down energy consumption is not a viable path, it’s just not going to happen. Quite the contrary, humanity’s energy consumption is likely to grow a lot.
I agree with you about keeping carbon in the ground - but it will only happen for economic reasons in reality (ie. solar being cheaper than oil and gas) and the transition will take decades.
I hope we don’t hit irreversible feedback effects in the next couple of decades!
I know every generation feels special - the pinnacle of humanity, a special time - but this time around it really feels like what happens in the next 20-30 years can have make it or break it consequences for later generations (not just climate, also chemical pollution, risk of nuclear/biological weapons use and possibly AI - though that could also solve a lot of our problems)
So does the CO2 itself. The oceans are getting more acidic already, killing shellfish and throwing off food webs.
Throwing additional geoengineering on top of the geoengineering we're already doing will almost certainly cause as many problems as it solves. It would be so much simpler, cheaper, and more effective to just stop digging carbon out of the ground and putting it in the sky.