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College of Food, Agricultural, and Environmental Sciences


Smart Stuff with Twig Walkingstick: New Fuels? Cool! (for the Week of March 2, 2008)

March 2, 2008

Q. Dear Twig: You talked about electric cars. What other ways can you run a car?

A. Well, you can push it yourself. Ha ha ha! Kidding. ["Not funny": Twig's niece Elderberria.] OK, here are some of the other ways:

Biodiesel: Liquid fuel made from vegetable oils and animal fats. Renewable.

Ethanol: Liquid fuel made from starch crops such as corn. Renewable.

Natural gas: Either compressed (as a gas) or liquified (into a liquid). Non-renewable. Pollutes less than gasoline.

Hydrogen fuel cell: Hydrogen goes in the fuel tank, which fuels the fuel cell, which makes electricity, which runs the car. Only "exhaust"? Water. Earth has lots of hydrogen.

Propane: Liquified petroleum gas. Pollutes less than gasoline. Plus makes for cheaper vehicle upkeep.

Note: They all work only in special cars. That is, you can't just pump French-fry-oil biodiesel into your dad's Pinto and expect it to run. Urps!



P.S. All these fuels are in many different stages of use and development. Mmm, French-fry fuel ...

Notes: Check out, for starters, the Web site of the U.S. Department of Energy's Alternative Fuels and Advanced Vehicles Data Center, Other alternative vehicle fuels include solar energy (; compressed air (, and hay/oats fuel cell (

"Smart Stuff with Twig Walkingstick," published by The Ohio State University College of Food, Agricultural, and Environmental Sciences — specifically, by the Ohio Agricultural Research and Development Center (OARDC) and Ohio State University Extension, the research and outreach arms, respectively, of the College — is a weekly column for children about science, nature, farming and the environment. It's written at a 4th-grade reading level. For details, to ask Twig a question, and/or to receive the column free by mail or e-mail, contact Kurt Knebusch, CommTech, OSU/OARDC,1680 Madison Ave., Wooster, OH 44691,, (330) 263-3776. Online at


Kurt Knebusch