Here it is, ta dum, Biosphere 2!
The highly publicized 1990's experiment of living sustainably in a sealed-in atmosphere and environment was, according to the media, a failure in that about a year and a half into the experiment, it was necessary to add oxygen to the system in order to keep the crew functioning. Nevertheless, eight people did live within this environment for two years, raising their own food and making a multitude of scientific observations about the system.
I drove up the road in high anticipation of learning somethng new and fascinating. I remember envying the people who were part of this experiment when it was taking place. Now that would have been an adventure of the highest order!

In this beautiful setting, I caught my first glimpse of Biosphere 2. Biosphere 1, of course, is the Earth, where the experiment of sustaining life in a closed system has not yet been completed.
Here is a closer view of all the components -- sealed, air-tight. To the left, the pyramid is the huge greenhouse that contains five different environments with many species of plants and, during the experiment, animals as well. The central slightly rounded building with the round tower houses the living quarters on the left side, called the 'human habitat' of the unit. The right side is the work area for the Biospherians, with desks and computers. The three curved structures behind are greenhouses that contained the 'farm' where food was cultivated and animals were kept. The little dome on top is the library. Looks pretty sci-fi doesn't it!

Each of the eight had specific tasks to be done on a daily basis, since there was an incredible amount of monitoring and maintaining required. And every eighth day, each person would have their turn as cook, preparing meals for the entire crew, who ate together in a common dining room, which is just to the right at the end of the hall in the first picture below. Their snazzy Scandinavian-designed kitchen in the second picture had the most efficient appliances available at the time.

Each also had a private apartment, here's one side of it -- on the other side is a staircase leading to a second-floor bedroom. They decorated these apartments according to their own tastes.
Here's a view of the farm area. There are three greenhouses adjoining that comprise the farm, you can see only the middle on in the picture below. In addition to raising vegetables and berries, they kept chickens, pigs and goats as well. They were not as successful at farming as they needed to be however and although their food was nutritios and they did not suffer ill-health, it was low in calories and consequently the crew lost an average of 24% of their weight during the two years. They complained of being hungry much of the time.
Here's the main glass pyramidal structure that contains the five biomes, environments, which are still maintained for experiments.
You can see here the aluminum frame structure and the hundreds of thousands of glass panels.
First we entered the savannah and ocean environments, one on each side. 
The ocean is 25 feet deep, has a coral reef which is no longer alive, and in the beginning had over 100 species of fish, most no longer alive. There is a 'wave machine' that creates waves that wash up on shore. At some point, someone used the 'tsunami' setting and created a wave so huge that it washed most of the white sand beach on the end out into the center floor of the ocean.
The savannah recreated the conditions of coastal Africa with huge acacia trees.

And here's the desert -- not an Arizona desert however, but actually a recreation of a Californian desert.
The rainforest felt the most exotic, with tall ferns and trees and constant raindrops falling in the 100% humidity environment. You can see the mist.

In the living experiment, this rainforest had 6 monkeys in residence. After a time, the biospherians felt they needed the higher calorie bananas that were being produced for the monkeys in this environment and began to 'raid' the forest. The monkeys became quite upset and aggressive and were eventually removed through an airlock passage and door. A lesson for eternity in that experience I believe. Right, don't steal somebody else's bananas! And the corollary would be don't fight back if you don't have any power. Yikes.
The fifth environment is the mongrove swamp. Our tour guide pointed out the density of the root system of the mongrove trees and noted that had they still survived along the Asian coast hit by the tsunami of a couple of years ago, they would have blocked the wave from being so devastating to life and property. Our guide pointed out frequently the negative impact of many of the more recent changes in our environment, changes that have resulted from our more-money- quest.
Underneath this huge structure is an equally huge basement filled with all of the necessary equipment to sustain these different environments.
Here's a tunnel that went to one of the "lungs" -- there were two.
Here's the outside view of a lung.
This structure had a huge bladder inside that inflated and deflated with the expansion and contraction of air each day and night, necessary to prevent the air pressure from exploding the glass. It is such a vital factor in maintaining the entire pyramid and greenhouses that there are two of them, the second is a backup that has never been used.
Water, oxygen, waste, everything was recycled within this closed system. The only 'outside' support was that this complex does not produce its own energy. It is powered by natural gas generators housed in these separate buildings. I found this to be quite surprising, since the early 1990's certainly had the technology for solar power.
Construction on Biosphere 2 began in 1987 and ended in 1991. It was the dream project of John Allen, ecologist and inventor, and was financed by a Texas multi-millionaire, Edward Bass. It was intended as an experiment to demonstrate how life might be colonized on other planets without our supportive atmosphere or resources.
The main problem of Biosphere 2's original mission, the lack of oxygen, was largely influenced by the failure of plants to photosynthesize adequately during the first winter because of lack of sunlight. El Nino produced a great deal of cloudiness in Arizona that winter and additionally, the sun's rays were lessened in intensity because of a volcanic eruption on the other side of the planet. They also failed to allow for adequate curing of huge amounts of concrete used in constructing Biosphere 2, so the curing process was still completing while the first mission was in progress, a process which consumes oxygen.
A second disturbing outcome was that the eight people inside did not get along well. Fairly early in the project, they split into two factions, the scientists and the idealists, or dreamers. As their oxygen supply diminished, they became more and more irritable and less able to fulfill their tasks. Many of them never returned to Biosphere 2 after the mission ended, but some still work to publicize and create opportunities for further learning from it.
Since testing the theory of creating a community in outer space, Biosphere 2 has come under the management of the University of Arizona. It is an incredibly valuable tool for examining ecology and especially climate change, since so many variables can be completely controlled.
So far, the indications are that we're in trouble in Biosphere 1.
Well it made me wish I were a graduate student in environmental sciences at the University of Arizona!
Here's one last look at Biosphere 2 where she nestles mostly unseen in her mountain hideaway, with many more stories to tell than I learned about on my visit.
Today was a good day!