The industrial district of Locastus, where huge, cathedral-like factories rise over the low brick houses, and tall ivy-choked chimneys spew out black smoke, day and night.
As population increases, animal souls are promoted to human before they are spiritually advanced enough in terms of impulse control, etc.: this shouldn't have happened, but karmic progression is automatic, after all--it's a force of nature. But the 'animalization' of humankind bodes ill for civilization.
No doubt the same goes for elves, dwarves, and so on.