Biosphere 2, Finished in 1991, was intended to see how a closed system ecology could work as a means for living in space, on other planets, and even living more efficiently here on Earth. It is a large structure incorporating many of the biomes native to earth and specifically to create a system which could support a human population without the need for external food supplies. There were several missions conducted there to determine the feasibility of such a closed environment. Unfortunately, the first mission failed due to wildly fluctuating levels of carbon dioxide and as a result, many of the plants died. The second mission, while a success in terms of the science and sustainability for a period of time, was sabotaged by a disgruntled member of the team which led to external contamination of the air supply thereby voiding the validity of the mission. As of today, Biosphere 2 is managed by the University of Arizona and is used as a laboratory for climate change among a few other things.