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ADVANCE FOR SATURDAY APRIL 12 AND THEREAFTER - The Schaus-Vorhies Kleaning Inc. plant, left, supplies waste heat to a nearby greenhouse, right, in Fairfield, Iowa. The recycled waste heat may be the first use of it's kind in an Iowa greenhouse. (AP Photo/The Register, Christopher Gannon) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT
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ADVANCE FOR SATURDAY APRIL 12 AND THEREAFTER - Mark Burnham, owner of Schaus-Vorhies Kleaning Inc. in Fairfield, Iowa, supplies waste heat from its sand fluidized bed, at right rear, to a neighboring greenhouse. The recycled waste heat may be the first use of it's kind in an Iowa greenhouse. (AP Photo/The Register, Christopher Gannon) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT
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ADVANCE FOR SATURDAY APRIL 12 AND THEREAFTER - Fairfield Middle School sixth graders Avery Yates, 11, left, and JT Metcalf, 12, get a close look at pea sprouts during a visit to a greenhouse Friday, April 4, 2014 in Fairfield,, Iowa. The greenhouse uses waste heat from nearby Schaus-Vorhies Kleaning Inc. The recycled waste heat may be the first use of it's kind in an Iowa greenhouse. (AP Photo/The Register, Christopher Gannon) MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT
