"gatt" wrote:
Sugar grows really well in places like Louisiana.

Corn, sugarcane, and other crops appear to be dwarfed by the energy
delivered by a family of organisms dating back nearly 3.5 billion years:

Algae.

See:
http://www.physorg.com/news89400502.html
http://en.wikipedia.org/wiki/Energy_content_of_Biofuel
http://en.wikipedia.org/wiki/Algacul...sel_production

"Microalgae have much faster growth-rates than terrestrial crops. The per
unit area yield of oil from algae is estimated to be from between 5,000 to
20,000 gallons per acre, per year; this is 7 to 31 times greater than the
next best crop, palm oil (635 gallons)." (From the Algaculture article.)