Water can be considered an inexhaustible resource on our planet but its distribution is spatially random and extremely varying with time both on short- or long term horizons. In order for human society to be capable of ensuring enough water for new generations it not only has to search for new water resources but has to learn how to exploit water more efficiently and economically. About 96% of countries have sufficient resources of water. The problem is not in the physical lack of water but in water mismanagement and poverty. So the challenge for human society is to fight poverty and to exploit existing water resources more reasonably and efficiently.

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