Re: Good Freekin' Lord...
There is an upper limit of population, and we're heading for it at 11 billion* by the end of the century. By then population growth flattens out. This may upset people who would like the chance to sterilise or kill other people (certainly not themselves, of course), but I'm not going to weep over their lost ambitions.
To head off those who will say 'How can we feed so many people?', first you need to realise that we can already feed all the people on the planet. It's just that most of the food tends to be bought up -- and a good proportion of that left to rot -- by the wealthy nations. The populations of Europe and the Americas are set to shrink slightly, while Asia's will rise by a quarter. The difficulty will be in Africa, where the population is set to quadruple over the next 80 years (even with shrinking family sizes, because people born over the next decade are likely to live until the end of the century). However much of Africa's agriculture is still done at the family plot level, with nothing but a hoe and a spade: modernisation offers a way out of the food problem they'll otherwise face.
*Assuming we don't start the next set of resource wars after losing too much land to the sea. Or that Trump wonders what that big red button might do...