Space Pollution is a taboo subject.

Aerosols from launches (& fuel dumps), millions of pounds of Styrofoam dust, Space Weather (including hurricanes), Airglow.

There's too much Solar Radiation management happening for them to admit to it all at once.

Edit to add; Thank you for proving my point about it being taboo. Ya'll would rather downvote my comment then respond about how true it is. It's Collapsed too so less people will see it. Wonderful.