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Washington State Penitentiary sustainability committee chairman Richard Howerton, smiles as pulls up a carrot that he didn't realize had been planted in the "lettuce field."

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Prison: Going green saves green

Some of the biggest improvements have involved harnessing technology to increase efficiency.

WALLA WALLA -- While the Walla Walla State Penitentiary greenhouse and garden are the showcase of the penitentiary's recent sustainability initiative, administrators say that's only one aspect of a larger, more comprehensive project.

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