The primary function of the carbon cycle in the environment is to regulate and recycle carbon among the Earth's systems, including the atmosphere, lithosphere, hydrosphere, and biosphere. This cyclic process involves the exchange of carbon through various forms, such as carbon dioxide and organic compounds. Plants absorb carbon dioxide during photosynthesis, converting it into organic matter, while respiration, decomposition, and combustion release carbon back into the atmosphere. The carbon cycle is essential for maintaining climate stability and supporting life by facilitating energy flow and nutrient cycling within ecosystems.