"NASA scientists have proposed an ingenious and remarkably resourceful process to produce 'clean energy' bio-fuels, that cleans waste water, removes carbon dioxide from the air, retains important nutrients, and does not compete with agriculture for land or freshwater."
"Land plants currently used to produce biodiesel and other fuels include soy, canola, and palm trees. For the sake of comparison, soy beans produce about 50 gallons of oil per acre per year; canola produces about 160 gallons per acre per year, and palms about 600 gallons per acre per year. But some types of algae can produce at least 2,000 gallons of oil per acre per year."
There is a lot more science involved in this process but the basic idea is taking dirty water and using algae to clean it. After the algae is grown it can also be used in bio-fuels. The money made in this process can be vast once the technology is put into place and is made readily available.
http://www.nasa.gov/centers/ames/news/features/2009/clean_energy_042209.html
http://news.cnet.com/8301-11128_3-9933355-54.html
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