Honestly, I don’t know. And while this is not to say I don’t care, humanity and the world we evolved to live in have always survived under the existing conditions. Measurable amounts of man-made materials vaporizing into our atmosphere isn’t something humanity and nature have traditionally dealt with.
And sure, the earth is big, there’s a lot of space dust, and perhaps not a lot of it comes from man-made sources.
But at one point mankind also thought forests to be too big use up. We keep telling ourselves that we’re not running out of oil or that we’re not over a climate ‘tipping-point’. We thought we couldn’t punch a hole into the ozone with hair spray and air conditioning, but here we are, with one of the largest ozone holes on record this year.
A little concern is probably warranted, at least until scientists can study what the impact will be.