Tension is a good thing
Imagine a mini version of Planet Earth.
A 3.14-acre sealed greenhouse with a miniature ocean, a rainforest, a desert, a mangrove swamp, a savanna and a farm.
Biosphere 2 was a $150-million futuristic experiment. Built between 1987 - 1991 near Oracle, Arizona.
It was originally built by scientists to re-create the Earth's ecosystems in a closed ecologica…
