As much as seventy times more water is needed to grow food than for domestic use. Severely waterscarce countries such as Egypt do not have enough water to grow their own food and need to import food from elsewhere. Countries like the USA, Australia, China, India, Mexico and Turkey have made...

The North China Plain, including plains of the Yellow (Huaig He) River, Huai He River and Hai He River, has a very important political, economic and cultural position in China. Its population is 35%, its GDP 32% and its irrigated area 42% of the figures for the whole of China. The region is now...