Rock Doc

When you fill your tank, you likely see a little sticker on the pump saying part of the fuel is ethanol. Ethanol is a biofuel, which means it comes from plants like corn, rather than from fossil fuel -- ancient carbon that’s been buried within the Earth for millions of years.

Producing more biofuels is on the agendas of governments and private industry alike. Biofuels can potentially help nations become more energy independent. If a country can grow plants and produce biofuels from them, that nation could potentially import less crude oil. Biofuels, if done right, also could reduce the total a...