Too Many Cars

A car built in 2009 belches out 90 percent less tailpipe pollution as one built in the 1960s. But the net benefits to the atmosphere have not materialized, explains Global Warming blogger Emily Gertz, because the average "vehicle miles" driven per person has tripled. So making cars more environmentally friendly isn't enough: we also need to transform the way cities are built.

<a href="http://globalwarming.change.org/blog/view/hybrid_cars_smart_growth_carbon_knockdown">http://globalwarming.change.org/blog/view/hybrid_cars_smart_growth_carbon_knockdown</a>;

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