Concentrations of dangerous pollutants from rocket launches and satellite reentries in Earth's upper atmosphere might reach treacherous tipping points if constellations of hundreds of thousands of orbiting data centers get deployed in the next decade. https://www.space.com/space-exploration/launches-spacecraft/spacex-wants-to-put-1-million-ai-satellites-in-orbit-what-would-that-do-to-earths-climate