Southern Arizona's Biosphere 2 is three glass-enclosed acres of ocean, mangrove swamp, savannah, rainforest and coastal desert.

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Biosphere 2: Man-Made Wonder

The world's largest living science center is a half-hour north of Tucson.

Between 1987 and 1994, the $200-million Biosphere 2 structure with its two “lungs” and Energy Center was constructed on 40 rolling meadow acres west of the Santa Catalina Mountains and a half-hour north of Tuscon, ...

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