A prototype for an extraterrestrial habitat called Biosphere 2 that opened about three decades ago in southern Arizona has had a history as an intriguing and unusual attraction — but not as a wholly successful scientific research center. Now, proponents of the project say it can still fulfill its potential as a venue for valuable experimentation within an innovative life-supporting built environment.  Fulton Schools Professor Klaus Lackner, director of ASU’s Center for Negative Carbon Emissions, is among scientists who foresee possibilities for using Biosphere 2 to create mini-environments that will enable researchers to make more accurate climate predictions, develop more effective reforestation techniques and learn to create self-sustaining biosystems.