That doesn't really follow. We know that the planet will warm from CO2 because of the physics of it. We spend gazillions modeling the climate. The scientists

That doesn't really follow. We know that the planet will warm from CO2 because of the physics of it. We spend gazillions modeling the climate. The scientists will tell you that the models have been very accurate (other will say otherwise, but...) Those same models can be used to test various geo-engineering efforts. And should have similar accuracy. Whether we should pursue those efforts is a matter of policy. But, rationally, we should definitely consider it. Personally, I think that a small-ish (and growing) CO2 tax combined with a realistic effort to invest in nuclear will be enough to save us from really bad results. But plenty of people push back on those two things (from each "side"). So, here we are.