But we are beholden to environmental conditions! All of our technology, including the base materials for artificial fertilizer come the environment. The unique thing about humans is the inter-dependence. We need people specialized in tasks to keep everything running. This requires the use of 'money' in whatever form to do the bookkeeping on distributing resources. I think what we are seeing is that the 'money' aspect our human interactions seems to be key constraint on people having more babies.