What Went Wrong in Biosphere 2? | Smartest Year Ever (Aug 7, 2025)

In the early 1990s, eight people sealed themselves inside a massive glass dome in the Arizona desert. Their mission? Create a completely self-sustaining ecosystem—no outside help, no resupply, no backup plan.

What happened inside that dome was stranger and more revealing than most people realize. From plummeting oxygen levels to runaway banana plants, exploding cockroach populations, and silent psychological breakdowns, the Biosphere 2 experiment became a wild intersection of space colonization dreams and real-world chaos.

Funded with $200 million, designed as a prototype for space habitats, and eventually dismissed by critics as science theater, Biosphere 2 was a real-life human experiment that tested how hard it is to replicate Earth—and how easy it is to wreck it.

But the full story is more complicated—and more relevant—than its punchlines.

Gordy breaks it all down in today’s episode of Smartest Year Ever.

Stick around to learn why this 1990s experiment may hold clues about the future of space travel, climate science, and the fragile balancing act that is life on Earth.

Sources:

• Nelson, M. (2018). Pushing Our Limits: Insights from Biosphere 2. University of Arizona Press.
  

• Marino, B. D., & Odum, H. T. (1999). Biosphere 2: Research Past and Present. Ecological Engineering, 13(1-4), 3–9.
  

• Smithsonian Magazine. (2017). The Strange, True Story of the Man Who Built Biosphere 2.
  

• University of Arizona. (n.d.). Biosphere 2 Overview. https://biosphere2.org
  

• Science Friday. (2011). The Science and Lessons of Biosphere 2.
  

Music thanks to Zapsplat.

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