There are many believers in alternative fuels these days, be it biodiesel, ethanol or butanol, who wish to share their knowledge and passion about the energy potential of renewables to the masses.

Rather than pulling sequestered hydrocarbons out of the ground, we're using the same carbon over and over in a renewable cycle. Another major benefit of biodiesel is that it can be produced ...

But, what role will renewable fuels – such as biodiesel and bioethanol – play ... low contributions to the carbon cycle, and in some cases lower amounts of greenhouse gases.