Sometimes dumb-sounding ideas actually work. Pollution is a serious problem for many cities, so it's sensible to at least consider whether this idea might actu

Sometimes dumb-sounding ideas actually work. Pollution is a serious problem for many cities, so it's sensible to at least consider whether this idea might actually have merit. Even if the answer is no, at least those of us who read the article and comments here have perhaps a better understanding of the problem.