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CO2 Solutions: Cars, Not Density

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A new report by the National Academy of Sciences (NAS) says there's no evidence that increasing housing density would significantly reduce CO2, reports the Technology Review. "Urban planners hoping to help mitigate CO2 emissions by increasing housing density would do better to focus on fuel-efficiency improvements to vehicles, investments in renewable energy, and cap and trade legislation now being voted on in Congress, according to the study, released Tuesday." More from Dirt, which quotes the study: "An immediate 0.1 percent reduction in the weight of all vehicles nationwide would be 10 times more effective at reducing greenhouse gas emissions than an immediate 0.1 percent increase in housing density nationwide." [TR, Dirt]