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        Nasa Tour of the (Omega) System | Earth's Resources

        SAN FRANCISCO - APRIL 17: Jonathan Trent, the lead scientist for NASA's OMEGA project, leads a tour of the wastewater biofuel system at the San Francisco Public Utilities Commission's Southeast Water Pollution Control Plant April 17, 2012 in San Francisco, California. The OMEGA, or Offshore Membrane Enclosures for Growing Algae project, uses treated sewage to grow algae in floating tubes that can capture carbon dioxide and produce biofuel without competing with agriculture for water, fertilizer, or land. (Photo by Sarah Rice/Getty Images)

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