Biosphere 2 is a self-contained, man-made habitat that comprises all of the elements from Earth (Biosphere 1). It is a sealed glass and space frame construction with seven wilderness ecosystems. Today, Biosphere 2 is operated as a research station by Columbia University, which also maintains a branch of the university on the grounds. Guided tours take visitors through several of the biomes, as well as the biospherian's former living quarters and the technical rooms that control the various interior climates. For more information call 520-896-6200 or visit www.bio2.com.