We've got a serious overpopulation problem...
No, we don't.
Um, yes we do.
According to the population institute, it took only 14 years, from 1999 to today, for the global population to increase by one billion people... just 14 years.
It takes about 1 acre of land to support the average human with food. That doesn't take into account any land needed for energy production or clothing production, or even *oxygen* production. It doesn't take into account the watershed land needed to provide for clean drinking water. It doesn't take into account the land needed for landfill waste. It doesn't even count the land needed for cemeteries for all those people when they're over. It doesn't take into account any land that people might want to use for recreational purposes. The 1+ acres is just for food per person.
According to the 'agricultural land' wiki, there now exist around 12,071,900,000 acres of pasture, crops, and orchards currently in production. There isn't all that much more arable land outside of that... the rest is deserts and mountains and oceans and rainforests, and they all have crappy soil that won't grow food. With 7,120,313,000 people on earth today, that is 1.69 acres per person. On the whole planet.
Based on those numbers, how many more billions pf people do you think can the earth support? (The earth's population is currently increasing at around 211,000 persons per day, and that number will keep going up with time.)