Carbon cycle is a series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels. 

● About 49% of the dry weight of living organisms is made up of carbon. 

● The ocean reserves and fossil fuels regulate the amount of CO₂ in the atmosphere. 

● Plants absorb CO₂ from the atmosphere for photosynthesis, of which a certain amount is released back through respiratory activities. 

● A major amount of CO₂ is contributed by the decomposers who contribute to the CO₂ pool by processing dead and decaying matter. 

● The amount of CO₂ in the atmosphere has been increased considerably by human activities such as burning of fossil fuels, deforestation. 

Affect of Deforestation: The plant convert the atmospheric CO₂ into organic compound by the process of photosynthesis. Due to deforestation the plant performing photosynthesis will decrease and less amount of CO₂ will be fixed into organic compounds. In this way the amount of CO₂ will increase in the environment which could further lead to greenhouse effect and global warming.