Renault compared the lifetime impact of gas, diesel and EV versions of the same care including raw materials, manufacture, delivery, operation and end of life over 10 years or 100,000 miles of use. Spoiler alert: EVs do well in this study. Article includes a link to download the original 116 page report or a 4 page summary.
http://green.autoblog.com/2013/07/12/renault-study-proves-again-evs-are-cleaner-than-gas-or-oil-bur/
http://green.autoblog.com/2013/07/12/renault-study-proves-again-evs-are-cleaner-than-gas-or-oil-bur/