When your grandparents pulled up to the gas pump, there was basically one choice: leaded ethyl. Gasoline containing lead contaminated the environment and was eventually banned. It hasn't been sold at gas stations (legally) in the United States since 1995.

A more environmentally-friendly, unleaded alternative was needed. Car makers adapted to the changes at the pump by developing engines that ran on unleaded gasoline. But this cleaner fuel, used today, was still an oil product and a source of pollution.

A new generation of fuels is again changing the pump: ethanol, biodiesel, hydrogen, electric, even compressed air. These are being developed partly because they are cleaner and partly because they don't rely on fossil fuel. Access to oil and the increasing cost of production have fuel and car makers considering a growing variety of renewable energy sources.

These are exciting times for research and development. It makes you wonder what will be available at the pump in the next ten years.

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