Imagine (voluntarily) locking yourself in an enclosed space for two years, growing your own food within a glass bubble.
This was reality for eight scientists and researchers — the “Biospherians” — who entered in the Biosphere 2‘s first mission from 1991-1993. The Biosphere, tucked in the mountains in Tucson, Arizona, was invented to see if humans could survive in an enclosed space in case of extreme future CO2 levels (which is already becoming a reality) or a space colony, for example.
The Biospherians lived off the 5 ecosystems in the Biosphere 2, producing crops in a self-sustaining bubble. The bubble is made up of several ecosystems, including the rainforest, ocean, savanna and desert, to name a few, all of which are populated by plants and animals.
The Biospherians cultivated their own garden, which produced a very “farm to table” approach to food, as they could only prepare what was ready to eat.
Over the next two years they grew 80 percent of their food, something NASA has never attempted. They recycled their sewage and effluent, drinking the same water countless times, totally purified by their plants, soil, atmosphere, and machines. (Discovery Magazine)
Despite good intentions and fact that the scientists made it 2 years within the walls, the experiment has largely been publicized as a failure. Rising CO2 levels inside the glass dropped oxygen levels, and food production waned.
As oxygen was converted to carbon dioxide, free oxygen in the atmosphere declined. By January 1993, Biosphere 2’s carbon dioxide levels were 12 times that of the outside, and oxygen levels were what mountaineers get at 17,000 feet. The crew’s doctor was having trouble adding up simple figures and disqualified himself from duty. So, a year and four months into the mission, tank trucks containing 31,000 pounds of liquid oxygen started driving up the access road to the site. (Discovery Magazine)
Despite the deemed “failure,” the Biosphere 2 experiment left behind some great science, namely an entirely enclosed infrastructure with the aim of keeping humans (and plants and animals) alive. I walked around the basement of the dome, as well as the “lungs,” and was blown away by the recycled sewage and water systems, which they recycled for 2 years.
It also informed how the carbon cycle and oxygen dynamics in humans connect, as well as continues to provide ecological data and fodder for visiting scientists.
And why Biosphere 2, you may be wondering? Because Earth is the original Biosphere. Read more about the Biosphere 2 here.