Oppose Traffic Calming in BERKELEY California?

Dave Winer raised the following question (courtesy Mark Haas) on Scripting News:

Do Berkeley's infamous speed bumps, traffic diverters and other traffic-related policies, like politically-motivated, too-low speed limits raise the city's carbon footprint?

Now perhaps the good citizens of my hometown of Ontario are less concerned about carbon footprint - let's face it, the Ontario Mountain Village Association wants people to drive all the way to Chino to shop, which certainly increases the carbon footprint - but it's an interesting argument.