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The city is the embodiment of life in the 21st century. But the limits of the modern metropolis model are being tested by worsening pollution, transportation woes and land-use issues. The path to sustainability of the model may lead through Portland, Oregon.

A stain on Portland's pride
The river that runs through the U.S. poster city for sustainable urban development may be polluted, but in Portland a simple cleanup is just the first step toward full restoration. Full Story>>
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Locals in action

Is it all garbage?
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Corporate green
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A walk on the wild side
Only in Portland could a dump be transformed into a wildlife refuge, where herons and muskrats roam in sight of downtown skyscrapers. Full Story>>