Why have there been no further attempts at the Biosphere project? It’s been almost 30 years. With people talking about space/Mars colonization and panic over climate change, it seems like a good idea to know how to live in a closed system. Maybe it’s just me, but when I start managing small things well, that momentum grows to larger projects. If we knew the minimum amount of resources required to keep people happy and healthy in a sustainable way, I think we could manage the world better.