Greenhouses Green with Envy

"When it comes to energy use, conventional greenhouses aren't all that "green." For example, it takes hundreds of gallons of propane each year to heat the 816-square-foot greenhouse at the Dartmouth Organic Farm.

Not so for the farm's second greenhouse, being built new this summer on the farm's site on Route 10, three miles north of campus: thanks to passive-solar and energy-conserving features, this one won't need fossil fuel to provide a reasonable growing environment."

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