China's use of 'night soil,' as the Chinese rightly call a manure that is collected after dark, is probably the reason that its soils are still healthy after four millennia of intensive agriculture, while other great civilizations - the Maya, for one - floundered when their soils turned to dust.

Along with all the other stunning statistics China can provide, it can also claim to be the world leader in making energy from human excrement. Biogas, as this energy is known, can be produced from the fermentation of any organic material, from wood to vegetables to human excreta.

In the Communist era, excrement took on political importance, because Party policy decided excrement was essential for the Great Agricultural Leap Forward.

Rose George Quotes