looks like population increase is gonna flatline between 10-11 billion, but we just don't have the resources to support that so I expect that by the end of the century with climate disasters and wars over limited resources we'll be back to 4-5 billion which -might- be sustainable with better technology and wiser decisions and a world government enforcing it which might be possible after the resource and climate disaster that the human population will face. Hopefully it will be patterned after western democracies and not Chinese/Russian totalitarianism.