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| | EPA-MAIA - Urban Ecosystems (Site not responding. Last check: 2007-10-08) |
 | | So cities are just a somewhat more complicated kind of ecosystem, and new interactions among researchers will be required to understand cities as ecosystems. |
 | | Philadelphia, Pittsburgh, Baltimore, Washington, DC, Richmond, and Norfolk are among the largest cities in the United States. |
 | | A combined research team of ecologists, social scientists, economists, and engineers are all involved, along with city, county, state and national agencies, and citizens and community groups. |
| www.epa.gov /maia/html/urban.html (544 words) |
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