"If the Earth is unable to sustain approximately 7 billion people at an acceptable standard of living, how can we hope to sustain 9 billion or 12 billion? "
With space age metals and sonic superconducting flange widgets!
The UN has been working on this since the 60's, and their efforts are paying off. From what I understand, the only real way to stabilise the population and maybe reduce it is through raising the global standards of living, supporting universal rights through women and children's rights, education and healthcare.
