Works of Dénes Ruzsa
The Biosphere 2 project was an experiment in the state of Arizona, the terrestrial biosphere was copied. They modeled the American landscape. They wanted to achieve a completely self-sufficient system. The experiment failed, all the insects died, the oxygen disappeared drastically, so it had to be refill from the outside. The lesson learned from the experiment is that humanity is not yet able to create a self-sustaining biosphere.