A startup announced just over a week ago that they're already performing solar geoengineering with sulfur particles: https://www.technologyreview.com/2022/12/24/1066041/a-startu...
The US has started a 5 year program to research climate interventions. I expect as it becomes clear we're going to miss the 1.5 degree Paris goal funding will explode in this area: https://www.economist.com/interactive/briefing/2022/11/05/th...