Predatory journals and the pollution of academic publishing

I am writing this in China and, looking from my hotel room, I can barely see beyond the buildings on the other side of the street. It's pollution; it obscures vision, and exposure has. adverse effects on health. I think 'pollution' is an excellent metaphor for what we are currently seeing in academic publishing as a result of the seemingly inexorable increase in the number of predatory publishers and the 'fruits' of their labour, the predatory journals and predatory conferences.