The diagram describes the carbon cycle, a natural process that involves the usage of carbon dioxide (CO2) in various points.

The diagram describes the carbon cycle, a natural process that involves the usage of carbon dioxide (CO2) at various points. In general, this operation mostly consists of CO2 being absorbed and released by creatures and man-made creations, with some interactions between animals, plants, and energy. At first, CO2 in the atmosphere is used as a material for photosynthesis occurring in all plants. During their growth, the trees undergo a procedure called cellular respiration, in which CO2 is discharged to the environment. Similarly, this process can be found in animals when they stay alive by consuming nearby nutrients coming from meat or vegetables. Once the animals cease to exist, their dead bodies are disintegrated into a variety of substances, most of which are then utilized to produce fossil fuels. As the fuel is burned up, a mass amount of CO2 is created and flies up to the thin air. Apart from the non-renewable energy, gas emission from factories in large cities is also a prime source for the formation of CO2.