Biosphere 2 rises from southern Arizonas high desert like a bizarre hybrid spaceship and greenhouse. Packed with more than 3,800 carefully selected plant, animal, and insect species, this mega-terrarium is one of the world's most biodiverse, lush, and artificial wildernesses. Only recently transformed from an abandoned ghost dome to a University of Arizona research center, the site was the setting of a grand drama about humans and ecology at the...