The problem I see with bio-fuels is that when the dollar is weak both oil and corn skyrocket. They say oil has to be $80 a bbl for bio-fuel to be a cost effective alternative. Unfortunately these projects were made assuming $3 a bushel corn not the $8 a bushel it was back in 2008. If they ever find a way to convert non exporatable plants such as weeds to bio-fuel it may take off. Until then electric cars and geo-thermal heating/cooling seem to me to be the more likely choices.
Thanks for the reply. perhaps when the economy stabilizes we will see things come back. ETLY,VSPC and OOIL are some plays i found on alternatives that you mention. I have positions in the first two. I guess just other bets like UVSE for bio-fuel i have EVFL.