Although this thread is kind of retarded, I've actually semi-thought about this in terms of article marketers and those who use them a lot for backlinks. I've seen competitors pumping out 2-3 articles a day simply for the backlink to their site and for no other reason. Although that's just one guy, think of 1,000 or 10,000 people doing that for their site. That's a million articles a year being emitted that are pretty much worthless aside from their linking value. So in that sense, yes SEO's are "polluting" the web.
On the other hand, who gives a fuck?
.... !!