According to the United Nations and the World Watch Institute, water is expected to be the central issue of the 21st century. Almost all countries are under some degree of water stress at some time, with more than half constantly under severe stress.

Many countries with shared river basins are already fighting/disputing over the limited water resources  those using 50,000 litres per month (moderate water wasters); those with water consumption of 60,000 (high water wasters); and those using 70,000 litres or more per month (excessive water wasters) should be charged based on an increasing tariff rate, kind of like income tax tariffs. Such a tariff would then be fair (as the poor will not be victimised, only those who waste water).

Prof Dr CHAN NGAI WENG is co-ordinator Water Watch Asia and advisor Water Watch Penang. For water conservation tips visit Water Watch Penang .