For me, this is the key paragraph:

Few outsiders have gotten a glimpse of Stardust’s plans, and the company has not publicly released details about its technology, its business model, or exactly who works at its company. But the company appears to be positioning itself to develop and sell a proprietary geoengineering technology to governments that are considering making modifications to the global climate—acting like a kind of defense contractor for climate alteration.

If the past year has taught us anything, it's that we don't want to become more beholden to private capital for critical societal needs, and a stable atmosphere is at the absolute bottom of the pyramid. Dave Karpf has a great take on the geoengineering situation, so I'll let his words take it from here:

First, we have to believe that the science of geoengineering is rock-solid. Second, we have to believe the science of real-time climate modeling and forecasting has been basically perfected. You need your climate models to be extremely good in order to forecast what the effects of geoengineering will be. And you need the geoengineering not to have any surprising downstream consequences that the engineers couldn’t predict. You particularly need this because “termination shock” is itself a warning – once you start this process at scale, you cannot end it without disastrous consequences. You had better be right.

Geoengineering would absolutely be a minefield of unintended consequences. It has never been attempted before. We are incapable of testing it at scale without, y’know, actually pulling the trigger and trying. The degree to which we just don’t fucking know what the unintended impacts of geoengineering would be is off the charts here. The models are based on two major volcanic eruptions, with limited contemporaneous data collection. We’re starting from an N of TWO! Model it all you want, but those models will be based on assumptions that can only be refined once we’ve pulled the trigger on the giant silver bullets.