Interventions in this natural system are irreversible, and have impacts that are usually unpredicted or perhaps even unpredictable. Once the carrying capacity of the plateau was exceeded, the deer had no recourse but to consume the life support system itself. They eventually scoured the landscape for every edible scrap, even eating the bark of the trees. The carrying capacity of the Kaibab Plateau plunged to 10,000 as four out of five deer starved to death. Anything over that number consumes the life support system itself and lowers the carrying capacity.
Needs are natural desires, the same in all human beings, for they are inherent in human nature.
Moreover, there are a finite number of human needs. Material needs include such basics as air, food, water, shelter, sleep and physical security. Moral needs include service, meaningfulness, aesthetics, perfection, truth and justice. For example, a good education, a sense of community and a dependable job are needs. It is thought-stopping because it diverts attention away from the issue of life support system collapse and directs attention to politics.