I'm surprised to learn less than $2M per year goes into this type of research in the USA. Given the massive unknowns, it's something we certainly need to better

I'm surprised to learn less than $2M per year goes into this type of research in the USA. Given the massive unknowns, it's something we certainly need to better understand. Kind of like research on deflecting asteroids. "the U.S. Government and Accountability Office (GAO)"..."estimated that about $2 million were directed to “albedo modification and less conventional CDR approaches,” so less than 0.1% of the U.S. climate change budget focused on the strategies discussed in our report." (page 185 of the report)