Because cars are inefficient. So much so, that I'm pretty sure if you tasked an engineer to come up with the least efficient way of transporting people, they'd

Because cars are inefficient. So much so, that I'm pretty sure if you tasked an engineer to come up with the least efficient way of transporting people, they'd come up with something resembling a car. Electric cars are a good step, but they only alleviate a few downsides of cars.