Two-Thirds of the World Will Live in Cities by 2050

A group called 19.20.21 has just launched a five-year study of "supercities" with populations over 20 million. They'll look at how nineteen cities that have reached this "tipping point" population suddenly change: everything from waste management and water use, to art and crime patterns are affected. The group will… » 2/15/08 7:40am 2/15/08 7:40am