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...but once you get above 2000 ft altitude or more than 100 miles from the sea, human life becomes a bit marginal...
The British Isles and Japan are about the most intensively cultivated parts of the world, and could in principle sustain around one fifth of the present population indefinitely.
haiti is a good example. Forests cut down for cooking which allows runoff of silt into ocean which wrecks fishing grounds which causes extreme poverty which causes exodus to the USA so that haitians can overpopulate the USA and cause the same problems.The same goes for blacks and browns leaving africa for Europe and the UK.[/size]
I think the replies are missing the point.The point is that sooner or later, the number of people will reach a saturation point whether it is caused by lack of food, lack of water, lack of living space, lack of pollution dilution, lack of a good standard of living.