Some people tend to argue that in the world we will get to a point where the human population will start declining. I don't know where that roof is going to be but since the population is decreasing it is probably when the world is being stretched to its limits.
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There is always an optimistic point of view, that when we reach the point where is just impossible to have more people, we will need to colonize a new planet or something like that, in a long future! (China is going to mars in 5 years, already confirmed so...)