This thread is going a bit astray but the statement along the lines of:

The reduction of population would probably work but it would take too long, is terrifying to me. *Edit* "WILL" take too long is even scarier.

IMHO People are the best hope we have for innovating and solving the situation we find ourselves in, anyone preaching depopulation as a answer should be intensely scrutinized for what other beliefs they hold regarding final solutions.