The pyramid illustrates that there is a middle man type of chain to feed one human as compared to the people on the lower food chain that get their nutrition directly. Ihave thought about the question asked that if I would consider changing my diet to a person lower on the food chain, and the answer would be no. I like meat first of all and my second reason would be that humans need meat in their diet for certain vitamins and minerals in order to stay stronger. To summarize the carbon cycle is simple: Step one is Carbon enters the atmosphere as carbon dioxide from respiration [breathing]: and combustion (burning). Step 2: Carbon dioxide that is absorbed by producers in order to make carbohydrates in photosynthesis, these producers then put off oxygen. Step 3: Animals feed on the plants, thus passing the carbon compounds along the food chain and the animals and plants that inhale this as carbon dioxide eventually die