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http://fatknowledge.blogspot.com/2007/05/japan-and-battery-development.html
Algae Oil:
http://thefraserdomain.typepad.com/energy/2007/05/green_star_prod.html
Present available algae species can produce 4,000 gallons of oil per acre each year, which is 50 times greater than the oil yield from oilseed crops such as soybean or canola crops
4000 gallons per acre = 3.73 liter per square meter.