Since large parts of the world, especially in Africa, have yet to gain access to fertilizer and modern farming techniques, there is no reason to think that the global land requirements for a given amount of food will cease shrinking any time soon.
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Estimates made in the 1960s and 1970s of water demand by the year 2000 proved grossly overestimated: The world used half as much water as experts had projected 30 years before.
