Transportation Is a Major Driver of Climate Change

Between 1970 and 2007, U.S. transportation energy use and accompanying GHG emissions nearly doubled. This occurred even as the efficiency of light- and heavy-duty vehicles and aircraft increased, because increases in efficiency were offset by an even larger growth in overall transportation activity. Additionally, although the fuel efficiency of passenger vehicles improved, a large part of this improvement was offset by increases in vehicle size and weight, so the average fuel economy (miles per gallon) of new vehicles has been essentially stagnant for two decades.

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