> ...for extracting bio energy from very low productivity land.
>
Presumably this is the real potential of bio-fuels.  Even if the
energy payback is only 1%, if you have otherwise unusable land
that can be easily seeded and harvested for biofuels.  Current
"state-of-the-art" involves conventional techniques for farming,
fermentation, and distillation/conversion, but I don't see any
particular reason that energy efficiency of those operations
couldn't be improved a great deal (solar distillation to much
greater than 8%, etc.)

BillW
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist