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Geodesic greenhouses.(Brief Article)

* Practically impervious to heavy snow and high wind, the greenhouse dome pictured here keeps winter temperatures inside about 25[degrees] higher than they are outside--with no supplemental heat. The 22-foot-diameter dome, in Pagosa Springs, Colorado, lets its vegetarian owners grow much of their own food all through winter, although they once had to dig a path through 4 feet of snow to bring in the day's harvest.

Adapted from Buckminster Fuller's geodesic dome design, the wood-framed structure is glazed with double- or triple-walled polycarbonate triangles. Sunlight streams through the glazing and heats up water in a 1,200-gallon tank during the day, while a solar-powered ...

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