scienceyoucanlove: The human population just hit the 7-billion mark. It took 200,000 years for the human population to reach 3-billion. It took 40 years for the next 3 billion people. Is this a problem? Is Earth at it’s theoretical “limit” or is

scienceyoucanlove: The human population just hit the 7-billion mark. It took 200,000 years for the human population to reach 3-billion. It took 40 years for the next 3 billion people. Is this a problem? Is Earth at it’s theoretical “limit” or is

scienceyoucanlove: The human population just hit the 7-billion mark. It took 200,000