![](http://www.alamy.com/thumbs/6/0E20E15D-47FC-4BD4-B617-00E9F697594C/W71RXG.jpg)
A HIGHLY EFFICIENT SOLAR GREENHOUSE AT A SCHOOL IN ALBUQUERQUE, NEW MEXICO. BLACK BARRELS CONTAIN WATER AND ARE HEATED DURING THE DAY. PLASTIC PANELS ARE DOUBLE LAYERED WITH A SPACE IN BETWEEN. AT NIGHT STYROFOAM BEADS ARE BLOWN IN THIS SPACE AS INSULATION AND SUCKED OUT DURING DAY
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Photo credit: © Alpha Stock / Alamy / Afripics
License: Licensed
Model Released: No
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