We're overconsuming more than we're overpopulated. It's probably possible to reach sustainability with our current population if we curtailed consumption, but our consumption driven economy would have to change at a fundamental level. We'd need to impose strict taxes on waste and heavily subsidize efficiency while redistributing wealth from the ultra polluting ultra rich.

Overpopulation myths distract us from the real culprits of our unsustainable system. We need to cull the fat cats before we cull the masses. Population control should always be the last resort, while redistribution should always be the first.