How is Carbon is returned to the atmosphere through .?

Carbon is returned to the atmosphere primarily through processes like respiration, combustion, and decomposition. During respiration, organisms inhale oxygen and exhale carbon dioxide as a byproduct of energy production. Combustion of fossil fuels and biomass releases stored carbon back into the atmosphere as CO2. Additionally, when organic matter decomposes, microorganisms break it down, releasing carbon dioxide and methane, further contributing to atmospheric carbon levels.