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First ever biosphere project is 20 years old

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First ever biosphere project is 20 years old
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Man has long dreamt of living on another planet. But could human beings really survive in a self-contained biosphere?

Arizona’s daring Biosphere 2 project, the first ever large-scale attempt to replicate a miniature version of the earth, is marking its 20th anniversary.

www.b2science.org