― Using alternative fuel sources is not just a matter of environmental responsibility. It is good sense, and sound planning. Although most of us are in denial, the fossil fuels which form the backbone of our world economy are dwindling quite rapidly, even as we go about our daily business in our cars. ∙ Although few Americans use an alternative fuel source to commute, those who do will soon be have an advantage. If your alternative fuel source is your feet, whether through walking or bike [...].