This June 9, 2017 photo, Russ Finch shows off his tango mandarins, a hybrid that contains no seeds in Alliance, Neb. Finch has created greenhouses that run on geothermal heat. Geothermal heat produces heat from the ground through a singular heat source that dispenses heat through a tubing system. He began selling his geothermal greenhouses with his business Greenhouse in the Snow about three years ago. (Torri Brumbaugh/The Star-Herald via AP)
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