BIOSPHERE 2 TOO FAR AHEAD OF ITS TIME?
September 16, 2012
devils were spinning across dry fields on the first day of our visit to the Sonoran
Desert near Tucson, Ariz. That night we watched from a few feet away as hundreds
of lesser long-nosed bats visited hummingbird feeders at a friend's ranch. The
species, one of 28 bat species in Arizona, feeds on nectar from saguaro cactus
and other night-blooming desert flowers. On the next day flash floods and muddy
back roads became the norm as the late summer "monsoon season" began
in earnest. The desert landscape dominated by saguaro, the tallest cactus species
in the world, is impressive, rain or shine.
Much of southern Arizona retains the charm of the natural world. The creeping
sprawl of suburbia around Tucson is probably viewed as a threat by some environmentalists,
but extensive ranchlands, state parks, and the sheer vastness of the desert habitat
itself help ensure the ecological integrity of the region. So how in the world
did we manage to visit a tropical rain forest, a mangrove swamp, and a small ocean
while we were in the area? Welcome to Biosphere 2.
Only one biosphere on our planet has survived the test of evolutionary time. Earth's
biosphere--the global, self-contained operation of all ecosystems and life on
the planet--is the product of a process that began more than 3 billion years ago.
The evolutionary history of Biosphere 2 is considerably shorter. An early experiment
confirmed that it does not come up to par with the real world. The original idea,
conceived in the 1980s, was far ahead of its time but in keeping with the fast-developing
space program. NASA had demonstrated that under the right conditions humans could
survive for extended periods of time in spacecraft that orbited the earth or landed
on the moon. But what about an enclosed habitat where people could live indefinitely
in a self-sustaining system?
The idea that humans can populate city-size spaceships or live in colonies on
other worlds is a staple of science fiction. Biosphere 2 is the leftover facility
where the real-life experiment to test that idea was conducted in the early 1990s.
After a series of gigantic, dome-shaped modules were constructed, representative
of some of earth's major biomes were established. The airtight system was designed
so that earthlike habitats, including a small ocean with a coral reef, mangrove
wetlands, and a tropical rainforest, could function within a closed system. The
biomes were enclosed with glass panels on 3.1 acres. In 1991 eight people were
added to this biological stew with the ambitious plan of surviving in the self-contained
unit. Food and oxygen were to be produced within the enormous enclosed structure
while the group of scientists studied ecological changes.
A lot was learned, much unexpected, some unwanted. Roaches and an uninvited species
of ants increased in alarming numbers. Most birds and pollinating insects gradually
disappeared. Morning glories apparently had no natural control and began to overrun
some of the forest plants. The crew is to be commended for sticking it out for
almost two years, although according to some reports one of the participants left
the facility and brought food back. Other detractors claim that oxygen levels
became so low that fresh air had to be pumped into the facility. A few ecological
papers based on the experience were written for scientific journals. Eventually,
some insightful observations on human nature might also come from the project.
1994 human beings were no longer part of experiments within the facility. The
current owner, the University of Arizona, began using the facility in 2007 for
climate change research. Some might consider the Biosphere 2 structure that looms
out of the desert as the symbol of a failed experiment on extraterrestrial colonization.
And the facility may not be able to compete with the natural wonders of southern
Arizona. But Biosphere 2 is certainly worth visiting. And it offers unique opportunities
for research projects that can only be conducted in the world's largest greenhouse.
you have an environmental question or comment, email