Good old geoengineering. The principle has been shown to work - in 536 AD [1], volcanic ashes and/or a cosmic impact event caused decades worth of cooling, causing or contributing to millions of deaths, pest spreads and massive migration movements.
The problem is... if we screw it up and overhit our target, we're in for a repeat, just this time with billions of deaths.
The question is... aren't we in for the same if we let human-caused climate change run its course anyway, just with us frying ourselves to death?
All of these side effects just disappear if we were to engineer this dust to emit a lot of radiation outside of the absorption spectra of water vapour and CO2, absorb a lot of light in the the absorption spectra of water and CO2, mix it as pigment into paint, rooftiles, road surfaces, and so on.
That way absorbed direct radiation gets its climate change contribution cut about in half and probably much more for diffuse radiation.
We could also biologically engineer e.g. grasses to have similar effects.
I'm a huge fan of engineering various plants to emit light in specific wavelengths anyway, and making sure that e.g. insects pollinate and birds spread them much more preferentially. That way you can outcompete or naturally cross invasive species with them and then you'll just look from satellites were the stuff you dislike is spreading and send in automated drones to highly selectively spray anything that has weirdly glowing pollen stuck to it. And after repeating that a few times, you get rid of your trojan-glowies.
Would they cool earth in such a way that it would offset carbon dioxide uniformly or would it lead to even more change ? Climate change is undesirable, wether or not Climate warming is invloved.
And probably 3 meteor impact.