aptera 230 mpg electric 3-wheeled car Originally uploaded by mod*mom . The oil will not run out. It will just become more and more expensive. And will people kick the car habit when that happens? Not if they can help it. What are the alternatives? Hydrocarbons are the perfect transport fuel. They come in convenient liquid form and have a high energy density. One possible substitute is hydrogen. It can be converted into electricity using a fuel cell, with the cars driven by electric motors or it can be used in an ordinary internal combustion engine, suitably adapted. But fuel cells are likely to be expensive, since they use rare metals such as platinum. And hydrogen is difficult to store and handle, as it does not liquify except at very low temperatures, which makes it awkward and potentially dangerous to deal with. The biggest objection, however, is that energy is needed to manufacture hydrogen. As it does not occur naturally, it is not an energy source but simply a means of storing e...
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