That thread claims the Starship launches for Starlink are "expected to have a significant effect on the atmosphere," but for support it links to an article abou

That thread claims the Starship launches for Starlink are "expected to have a significant effect on the atmosphere," but for support it links to an article about the black soot emitted by kerosene-fueled rockets like Falcon. Starship is fueled by methane, a much cleaner-burning fuel.