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Re:West Virginia Engineer Proves to Be a David to VW's Goliath by happyscrappy on Wednesday September 23, 2015 @12:26PM (#10266019)
"Despite lower carbon dioxide emissions, diesel cars may promote more global warming than gasoline cars."

http://news.stanford.edu/pr/02/jacobsonJGR1023.html

Re:West Virginia Engineer Proves to Be a David to VW's Goliath by dalke on Wednesday September 23, 2015 @03:13PM (#10267380)
http://www.sciencedirect.com/science/article/pii/S0301421507... (available without cost from http://earthjustice.org/sites/default/files/black-carbon/bou... )

"Jacobson (2002, 2005) suggested that, despite their lower fuel efficiency, gasoline cars were better for climate than BC-emitting diesel cars. However, Jacobson’s analysis relied on radiative forcing (RF) and climate equilibrium calculations, which is artificial and possibly misleading because any policy or technology will only be implemented for a finite period of time"