If bio fuel is created from grain or corn, it seems to me very unethical given the hunger that is still wide-spread across the world. The bio fuel with a future however is gas from manure and compost where it is a byproduct.

Two more links to the topic:
"Food price rises are mass murder":
http://www.swissinfo.ch/eng/news/international/Food_price_rises_are_mass... Read on...