I got to say a few words on "Hell on Earth" about how biospheres - self-contained, fully-enclosed environments, with their own living systems producing recycling air, water, and food - could be a way of helping a small number of people survive the volcanic ash which would cover the Earth in the end-of-the-world Hell on Earth scenario. And I actually did have some passing experience with the Biosphere 2 out in Arizona in the 1990s - a real not hypothetical biosphere - having worked on other projects with one of the Biosphere 2's early bio-planners, Carl Hodges. The system was indeed mainly funded not by the government but a billionaire - Ed Bass - as I suggested on the show last night (see clips below). And it indeed partially failed, but mainly due to problems in keeping the oxygen at proper levels, and other ecological issues, and not because the inhabitants fell to fighting (though there were some intellectual disagreements among the inhabitants).
Dave Bartell did his customary good job of commenting. It was good to see him in the bunker last night, but we've once again gone to separate locations deep in the bedrock of Brooklyn, and will be back, with any luck, when the next episode, "Frozen Earth," airs on January 2, but a new time, 9 instead of 10pm Eastern. See you then!
See also How to Survive the End of the World on National Geographic and How to Survive the End of the World: The Story Continues
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from Evacuate Earth (2012) and Zombie Earth (2013