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Does it have to be a sheet of material? If all we want to do is shade the earth, we could launch a few million KGs of glitter into low earth orbit or to the Sun-Earth L1.
They would attract each other and clump into a loose ball.
Earlier quoted context omitted.
It could be the stability of Earth's systems is just an illusion created by observer selection. If it had not been within limits, we wouldn't be here. This places no constraint on how stable it will be in the future. Another part of the system that could be like that is the oxygen content of the atmosphere. The time constant for variation in O2 level is just a few million years (due to consumption of O2 by release of…
Stability is an illusion. It’s becoming increasingly evident that even small shifts in climate have triggered devastating events for humans, like the Bronze Age Collapse, plagues, and so on. Plus, there’s the whole end of the last glaciation that likely created the various flood myths and wiped out most of the megafauna.