Spaceship Earth

I remember visiting the Biosphere 2 when it was being built, and getting very excited about it. I also remember being very disappointed when it failed.

This is an interesting take on the project, starting long before it started, focusing on the group that made it happen - something between a commune and a cult. While that was all very interesting, they spent way too much time on it, and not enough on the details of the project itself, specifically why it failed.

My understanding is that they let hope blind them and the project never really had a chance to succeed. There simply wasn't enough plant mass to produce enough oxygen for that many people and animals. They never really discuss this in this documentary.