Consider this: If humans had been able to go into orbit around the Earth 100 years ago, they could have seen the light from 16 concentrations of a million or more people. Today, as the crews of the space station look down, they can see the lights of 450 shining cities of a million-plus.
Sixty-six of them are in Latin America – four of which… Rio, Sao Paulo, Buenos Aires and Mexico City… are among the world’s 25 largest metropolitan areas. In 2007, for the first time ever, more than half of us were city dwellers. By 2050, that number will rise to 70 percent. We are adding the equivalent of seven New York Cities to the planet... every year. Read More

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