It is estimated that 80 to 85 percent of the energy consumed in the U.S. is from fossil fuels. One of the main reasons given for continuing to use this energy source is that it is much less expensive than alternatives. The true cost, however, depends on what you include in the calculation, and there are so many costs not figured in the bills we pay for energy.
For the moment, we're still steering and braking, but we've gone far down the road to self-driving cars. A vast majority of the technology to enable at least some form of autonomous driving is either two years away from introduction, or already here. It's a matter of time, and the cognitive price we're going to pay for it is catastrophic.