Carbon cycle is the movement of the carbon between the world of animate beings and neorganic world of atmosphere, oceans, seas, mountains and soil. It is one of the most important biogeochemical cycles, which includes many complex reactions. Moreover, carbon is extremely important for supporting any form of life and the intrusion in this process; also it influences the amount and variety of animate organisms living on the Earth.

The main source of carbon for living organisms is the atmosphere. It exists there in the form of carbon dioxide CO2. Carbon dioxide is moved in the atmosphere by the winds vertically and horizontally. Furthermore, carbon dioxide is also in water, where it is easily dissolved and forms weak carbonic acid H2CO3. This acid comes into reaction with calcium and other elements making minerals. Furthermore, carbon with hydrogen and other elements is one of the main components of the cells of plants and animals.

Carbon comes from neorganic world into organic via photosynthesis. It is a chain of reactions when plants absorb carbon and then return it back during respiration. Marine animals and microorganisms use it in the same way. If the photosynthesis process stopped suddenly and carbon cycle distorted, the whole free oxygen would disappear.

Nowadays, the anthropological influence on carbon cycle is very significant. People use fossil fuels, which include coal, oil and gas stored for millions of years of the Earth existence. They are used in various industries, residential areas and agriculture. The result of fossil fuels burning leads to the increase of the greenhouse gases. Consequently, it leads to global warming. Moreover, deforestation results in the fact that more carbon is released and less is transformed by photosynthesis.

To sum up, people should consider their impact on the carbon cycle as their actions directly affect the change in the global climate. Furthermore, global warming will inevitably influence the whole ecosystem of the planet.