This is a copy of a post I wrote a couple of weeks ago. Doesn't seem shocking what is happening with the volt.
From the Environmental and Science Technology Journal (
http://pubs.acs.org/doi/abs/10.1021/es903729a) a study was done by the American Chemical Society. FTA: a diesel car that uses less than 3.9L per 100 km (which many do, Volkswagon Polo, Skoda, Subaru, etc.) has less environmental impact than a FULL electric car, let alone the Chevy Volt, which obviously has an internal combustion engine. This was also done with European power plants which obviously have significantly more nuclear and hydro electric generation. (See:
http://en.wikipedia.org/wiki/Electricity_generation which aggregates the CIA world factbook.)
Based on the difference in power generation in the United States (more fossil fuel based) and the fact that the Volt is also internal combustion, this would put the needed MPG much lower (30 or 40?) to have a lower environmental impact by using a Diesel.
The battery mining/processing in itself is extremely detrimental to the environment (note: the study only estimated the end of life disposal of batteries, it could be much worse). My point all along is that more efficient cars is a better way than creating the Volt product.
There is a future in electric cars but it relies around a major change in the grid in the United States and also the ability to recycle and mine Li-Ion batteries needs to be improved immensely. In the mean time the sales numbers are a manifestation of the fact that the Volt needs a major overhaul.