How much do SpaceX's reentering Starlink satellites pollute Earth's atmosphere?

Satellite megaconstellation operators are getting a lot of flak from atmospheric scientists lately for polluting Earth's upper atmosphere. But is the criticism justified? Who is the biggest contributor to the emerging environmental problem? About 40% of disused satellites burning up in Earth's atmosphere these days belong to SpaceX's Starlink megaconstellation, according to Andrew Bacon, the chief technology officer and co-founder of U.K.-based in-orbit manufacturing firm Space Forge. More

(Source: Space.com - Oct 18)