What are "alternative fuel sources"?

What are "alternative fuel sources"?

Terry Tamminen (Author & Environmental Policy Advisor) gives expert video advice on: What is a "green vehicle"?; What are "alternative fuel sources"?; How are "biodiesel" and "ethanol" created? and more...

Alternative fuel sources would include things like biofuels, ethanol which is made from plants, biodiesel which is made from soy and soybeans and other plants. Sugarcane can also produce biofuels. We're beginning to learn how to make biofuels out of what's called cellulosic material, meaning the stalk of the plant or woody debris or other waste materials rather than the corn or other high value products. Then other alternatives are things like natural gas, which, although it's a fossil fuel, we're beginning to harvest from renewable resources like the methane from sewage treatment plants, from animal confinement (dairy herds and things like that), and from decomposing material in our landfills. Other alternatives include electricity, from battery electric cars, and hydrogen.