Scientists expect problems to worsen if global warming upsets rainfall patterns. Dams and diversions may aggravate crises. As deltas and wetlands dry, ecosystems suffer. Most experts believe people won't save water until it costs what it is actually worth. Water is now essentially free.
Most consumers pay only the cost of treatment and delivery.
In some places, it is even illegal to meter water. But putting a value on water is touchy. Las Vegas authorities, for instance, insist their lavish use of water draws big spenders. Casinos among blazing lights and lagoons bring in far more than wheat and alfalfa. Sandra Postel, author of two books on global water issues, worries about monetizing water.