[toomuchtodo]

The share of wind and solar increases every year: http://www.eia.gov/totalenergy/data/monthly/pdf/sec7_5.pdf

A diesel vehicle has a service life of at least 200K miles; assuming 12K/miles a year, you're looking at ~16 years of burning petrol.

How much cleaner is the electric grid going to be over the next 16 years as coal plants are shut down due to being unable to meet new emissions guidelines? Electric vehicles future proof the energy required for mobility.