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How does your city’s carbon footprint stack up?

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The report is coming out a week before debate is expected to begin in the US Senate on legislation that calls for a 70 percent reduction in greenhouse-gas emissions by 2050 and imposes a price on carbon emissions.

“To me, the greatest takeaways from the report are the relative efficiency of metropolitan and urban areas, the variation of their performance, and the multiple influences that determine that,” says Mark Muro, policy director of the Metropolitan Policy Program at Brookings. “Metros are responsible for a large amount of the nation’s emissions but also offer the best prospects for large savings.”

Partial data for emissions rankings

Mr. Muro is quick to acknowledge that the data are only partial, in large part because of the difficulty in obtaining accurate information. The two major sources of carbon-emissions data are 2000 and 2005 US Department of Transportation statistics on highway usage as well as information obtained from Platts, a subsidiary of McGraw-Hill, on residential energy usage. But the rankings do not include traffic on local roads or the emissions of commercial, industrial, or government users.

“We really have a fragmentary picture of the country,” Muro says. “This is the beginning of the conversation.”

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