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February 21, 2007 3:58 AM PST

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At one end of the Moscone Conference Center is the Cleantech Forum. The other end is taken up by their natural enemy, the National Asphalt Paving Association. They do have a great motto, however: "Hot Mix Asphalt Issues Come to the Streets of San Francisco."

Photo by Michael Kanellos/CNET News.com

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