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… with arid climates the main constraint to agricultural growth is the availability of water rather than land.2 At the … only to increase. Already, around one third of the world's population live in countries that suffer from moderate to high water stress. Continued population growth and the effects of climate change, a …

… pressure on water resources as a result of such factors as population growth and, increasingly, climate change the last thirty or … hugely increased. The reasons are well known and include population growth, the rise of mega-cities, rising affluence …