What is the Optimum Capacity for Earth's Population? (Modern Esoteric)

The world population reached 3 billion in 1959, with the expected population in 2050 to reach 9 billion. To place the human growth trajectory in perspective, in 1957 it took 33 years for the entire world population to double, in the next 28 years it doubled again, and will again in the next 24 years. In October, 2011, the worlds population officially hit 7 billion, and this figure would require at least five planets to be sustainable. The world’s population is at more than 1400% of its sustainable level, and that is 14 times higher than its optimum capacity. A bumper sticker states: “The greenest action you can take is don’t breed.” Kindle location 868