These were among the first articles that went up and they needed updating. The articles can be viewed in the biodiesel FAQ located at 1000q: the FAQ index, see here: http://www.myturbodiesel.com/1000q.htm One change I made: Since the article was originally written, oil prices have gotten to WTF levels. Attention on the real accounting of carbon behind green fuels has come up and criticism of biodiesel comes with criticism of ethanol fuel. People are blaming high food prices on ethanol, but the single largest cause in the increase in fuel prices, not the increase of ethanol production. In the introduction to biodiesel making, I added some more links where people can learn more and changed some wording. Hopefully readers will find it informative.