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Increases in world population with there only being so much food that can be grown and only so much drinking water around. Our world is finite. Some people haven't worked that out yet hence poverty.
I understand that at least one nobel prize winner has said there is enough food for everyone it is just the logistics of distribution cause hunger. I assume the same thing is true for other necessities.
What you say may have once been true but times are changing. There are those who look at a map of Australia, for example, and say plenty of land for everyone. They don't know much of Australia is either arid or semi-arid. Also a rising salt problem.