That's according to a report from research firm Bloomberg New Energy Finance, which posits that in just six years, the biggest obstacle to the sale of EVs—they cost too much—will be obliterated and cars that run on electricity will cost less than those that run on dead dinosaurs.

"By 2022," the report says, "the unsubsidized total cost of ownership of BEVs [battery electric vehicles] will fall below that of an internal combustion engine vehicle." From there, the report projects a steadily increasing rate of adoption, reaching global sales of 41 million—25 percent of total market share—by 2040.

That's a remarkable prediction given that today, EVs make up less than 1 percent of new car sales in the US. Government subsidies and mandates are largely responsible for what consumer interest and R&D investment we've seen so far.