The carbon cycle involves the use and release of fossil fuels. Fossil fuels, such as coal, oil, and natural gas, are derived from the remains of ancient plants and animals, and their combustion adds carbon dioxide (CO2) into the atmosphere, contributing to the greenhouse effect and climate change. In contrast, the nitrogen cycle involves the conversion of nitrogen in the atmosphere into various forms that are utilized by living organisms, but it does not directly involve the use of fossil fuels.
