Choi, J., How does the change of carbon dioxide emissions affect transportation productivity? A case study of the US transportation sector from 2002 to 2011

Choi, J. and Roberts, D. 2015: How does the change of carbon dioxide emissions affect transportation productivity? A case study of the US transportation sector from 2002 to 2011. Open Journal of Social Sciences, 3, 96-106. doi: 10.4236/jss.2015.32013.