Nature has a way of solving problems though. Giving humans enough stupidity to make them kill each other regularly, witness two world wars. And if that doesn't work make sure there's a few nasty viruses from time to time, like Spanish Flu.Yes but it comes down to what I said a few posts ago with more people to feed all the time and less ground to feed them with it's just a downward spiral that can't continue.
It's been a while since we've had a major cull so expecting nature to rise to the occasion quite soon. And then the few remaining people can spend the future cleaning up the mess, like proper planet custodians should do.