And the Earth picks up about 40,000 tons of space dust per year. We've got a lot of work to do before our space "littering" can even dream of matching that lev

And the Earth picks up about 40,000 tons of space dust per year. We've got a lot of work to do before our space "littering" can even dream of matching that level... and that's just a coincidental level that nature happens to have, not some sort of threshold for "real harm", which I'd guess to be multiple orders of magnitude higher.