The document discusses the relationship between humans and the environment. It describes how humans and the environment interact and influence each other in a complex system. It provides examples of how human activities like overpopulation, intensive farming, land use, and water use can negatively impact the environment through issues like water scarcity, pollution, habitat loss, and climate change. However, it also notes that the human-environment system perspective highlights the interdependence between humans and nature and how humans can work to protect the environment.