On: Living on Mars: The Stuff You Never Thought About

[comicjk]

Also, it would be nice if we could make a self-contained ecosystem work on Earth before sending one into space. People seem to think this is a solved problem, but actually all attempts so far have lost their equilibrium pretty quickly, most notably Biosphere 2.

[Retric → comicjk]

They sell closed ecosystems as novelty items. Existing attempts to have people in them have tried to do way to much.