Transportation’s Role in Reducing U.S. Greenhouse Gas Emissions
http://ntl.bts.gov/lib/32000/32700/32779/DOT_Climate_Change_Report_-_April_2010_-_Volume_1_and_2.pdf
In two volumes. Examines greenhouse gas emissions levels and trends from the transportation sector and analyzes the full range of strategies available to reduce these emissions. From the Bureau of Transportation Statistics