Metaphor comparing Humans and Angels with Nature?

Angels? Why not stay in the real world? Imaginary entities are much harder to discuss using logical argument. Three is a very good start. Overpopulation exceeding carrying capacity and causing ecosystem collapse makes for a simple essay layout. Try comparing the environment to a rubber band. Our excess population and demands keep stretching it. Eventually it breaks. There are many examples of early stage unrestrained geometric growth of pioneer populations.