Few now doubt that successfully managing environmental challenges will be central to public policy in the coming century. Unless the international community can cope with transnational problems such as global warming, destruction of species and tropical rain-forests, depletion of oceanic fish...

Water is becoming increasingly scarce all over the world. All indicators of water availability show that per capita supplies will continue to decline in the years ahead. A conservative recent estimate projects that 1.8 billion people will live in regions or countries with “absolute water...