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People would keep reproducing. Countries would probably pass 'no reproduction' laws to keep population balanced, but obviously not everyone would comply. The world's population would grow exponentially and quickly at that. Animals and plants would become extinct, because humans needed the food. |
The world would reach its' carrying capacity. Scientists and such would most likely try to create living 'communities' underwater, on the moon, and in space stations. The issues of starvation and lack of space would run rampant. Natural selection would happen with humans, which is when certain types of a species are selected for (given natural conditions they live), or selected against (they do not have what is needed to survive so they die). For instance, rich humans and strong, tough humans would be more apt to live, because the rich could afford to buy the limited food, and the tough humans could kill people for their food, and steal the food. This scenario pertains to the assumption that humans would not die of diseases and such, but must be killed or run out of the necessities for living (food, water, shelter, air).
If you mean that no one could ever die, even if they were shot, burned, starved, suffocated, and eaten, then that would never ever happen; it's a fantasy. However, if that were the case, then at some point, if there were not more areas to live than the land that humans live on now, then we would end up so packed that it would be virtually impossible to move, and humans would be forced to be on top of other people. It would be ridiculously cramped.
Although, if humans lived forever, then I assume that we would all be extremely smart, and would have figured out solutions to the living situations, like on another planet, on the moon, under water, etc.