
The Biosphere 2 was a highlight. This is the project where volunteers spent 3 years enclosed in a self contained ecosystem as an experiment in the 1990's.
That experiment concluded but many others are under way.
Tours of the outside have been available since Columbia University took over in
1996 but never before last month were public tours allowed inside the biomes.
Columbia is conducting CO2 studies. The
controversy of global warming and greenhouse gases might be resolved right here in Arizona.
TOUR of Biosphere 2
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