Its not exactly a secret anymore. Sure it could be trash, if it had the right propertys.

This article recommends using aerosols, specifically sulfur.

https://salatainstitute.harvard.edu/the-science-and-ethics-of-solar-geoengineering/

Should humans inject aerosols into the stratosphere to reflect sunlight and cool the planet? If they did, which aerosols? How would that impact the weather? Who should decide if these tools are ever deployed?

Researchers investigating solar geoengineering often look at volcanic activity to study the cooling effect of the sulfate aerosols released into the stratosphere during eruptions. But sulfates produce well-known side effects: to human health, to the ozone layer.

https://www.bmj.com/content/377/bmj.o1150/rr-1

This article suggests, not using aluminum aersols, which is one of the most lightweight metals.

Solar geoengineering by injecting aluminum oxide aerosol into the lower stratosphere is a serious threat to global mental health

https://www.popularmechanics.com/science/environment/a62671913/diamond-dust-solar-geoengineering/

The team ran the compounds through a climate simulation and monitored their atmospheric effects for 45 years. Diamond dust both was the most reflective and didn’t clump, meaning that it was effective at settling out over the atmosphere and providing longer-lasting cooling effects. Diamonds are also chemically inert, so there’d be no threat of acid rain or another unpredictable reaction.

This study suggests using diamond dust lol.

But insert wacky dream sequence intro here, its all a conspiracy theoryyyy.

https://www.wired.com/story/the-nightmare-politics-and-sticky-science-of-hacking-the-climate/

I love the retard normies who think it would take legions of planes to do it too, they have no concept of space in a sphere, lmao.

You might think you’d need vast squadrons of planes to spray every inch of the sky, but the atmosphere actually does this dispersal itself. The neat thing about the stratosphere is that you can inject it with something—let’s say pink glitter—and it’ll spread all over the world, turning the skies shiny and rosy. If that’s the kind of thing you’re into.