Canadian-born marine biologist John Todd and his wife Nancy Jack Todd maintain that greenhouse treatment of municipal sewage is superior to conventional methods for four reasons. Which of the following is NOT one of these?

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     Greenhouse systems cost less to build.
     The Todds "living machine" approach creates only 15 percent as much sludge as conventional facilities..
     Greenhouse systems rely on photosynthesis and gravity rather than large mechanical devices, and therefore use far less energy.
     Greenhouse systems use less chlorine than conventional systems.
asked Apr 11, 2013 in Social Studies by anonymous
    

1 Answer

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Greenhouse systems use less chlorine than conventional systems.
answered Apr 13, 2013 by CoolCat ~Expert~ (2,305 points)

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