ALL electric vehicles actually do rely on fossil fuels. The only difference being that to put fuel into an electric car you plug it into the wall instead of taking it down to the gas station!
The reality is that while an electric care is slightly more efficient than an internal combustion, it still requires fuel. Use of mains power in most countries is still predominantly fossil based. So an electric car still runs on coal, gas, oil and even nuclear power.....wow not so environmentally friendly now are we!
The unfortunate reality is that most people are too ignorant to realise that no car, not even an electric one, is actually emission free. A fact that every marketing team, for every manufacturer of electric cars will exploit in the near future and this will generate copious amounts of sales and money.