Infrastructure is one of the biggest barriers to alternative energy. We have gas stations literally everywhere that can pump gasoline quite effectively. The problem here is that to turn that invention into a widespread car, you have to start replacing gas stations with salt water stations. And then you need something to create the radio waves. A car battery and alternator may be able to do the job, but if not, that poses a new problem. If indeed outside electricity must be brought in, that electricity has to come from somewhere, and that somewhere usually being coal-fired powerplants.