%0 Generic %T Transportation's role in climate change and reducing greenhouse gases : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, July 14, 2009. %U https://ezaccess.libraries.psu.edu/login?url=https://www.heinonline.org/HOL/Page?handle=hein.cbhear/fdsysaqyl0001&id=1&size=2&collection=congrec&index=cbhear