Most environmentally friendly motor fuel is diesel
no it isn't, not even by a long shot.. Natural Gas and Propane vehicles trounce them in terms of environmental impact. In most places, considering the power grid is rapidly cleaning itself up, electrics would as well.
Do you think that diesel fuel magically jumped from miles down in the earth, refined itself, and showed up in your gas station all by itself? It's a very energy intensive process, using a lot of electricity usually derived from coal or natural gas, and/or coal/natural gas burnt right in the refinery just to get it to that state. So not only is your diesel car a point-source polluter, it is very much a "remote polluter" in its own right..
2) you can bloviate about "remote polluting" electric cars all you want, but the fact of the matter is that coal, as a percentage of the US's energy mix is going down, not up, and its going down quite rapidly. And even if it wasn't (which again, it is), it is arguable that addressing emissions at one managed point-source is preferable to distributing the polution across thousands of engines all in various state of tuns.