There’s over 7 billion people on this planet of ours and some estimates peg the population to reach 10 billion by the end of the century. Given that there’s only a certain amount of land on Earth, is there a maximum amount of humans that our blue marble can support? Sort of! And that limit is tied to our diet and the land we need to dedicate to livestock (the size of Africa!) and crops (the size of South America!).
Basically, when 10,000,000,000 people inhabit this planet, things will look a lot different than it does now.