Share this postTransportistU.S. Carbon Emissions Fall by Most Since '82Copy linkFacebookEmailNotesMoreU.S. Carbon Emissions Fall by Most Since '82David LevinsonMay 21, 2009Share this postTransportistU.S. Carbon Emissions Fall by Most Since '82Copy linkFacebookEmailNotesMoreShareFrom Wapo U.S. Carbon Emissions Fall by Most Since '82PreviousNext