If we'd been here debating about 120-odd years ago—and, despite claims, I wasn't there then—what we would have seen is the internal combustion engine was the answer to a problem, not the problem. It was the answer to the problem of the time of a major environmental problem, which was horses. Horses, whose excrement was all over London, was all over New York, as were dead horses. "Something's required to fix this major environmental problem."—along came the internal combustion engine. And now, as we know, with that engine, like many things, the cure can become the disease itself.