Except for the fact you'll need external energy. and passive solar input through the glass space frame panels covering most of the facility, and electrical p

Except for the fact you'll need external energy. and passive solar input through the glass space frame panels covering most of the facility, and electrical power was supplied into Biosphere 2 from an onsite natural gas energy center. Furthermore, it probably won't be able to heat itself enough when the surroundings cool down below a certain treshold, something that could very likely happen when a new ice age hits.