What process adds carbon dioxide to the air?

The process that adds carbon dioxide to the air is primarily known as respiration. During respiration, living organisms (including animals, plants, and microorganisms) consume oxygen and organic compounds, releasing carbon dioxide as a byproduct.

Another significant contributor to carbon dioxide in the atmosphere is combustion, which occurs when organic materials (such as fossil fuels, wood, and biomass) are burned. This reaction releases carbon dioxide and other gases.

Additionally, decomposition also contributes to the increase of carbon dioxide levels. As organic matter breaks down, carbon stored in these materials is released back into the atmosphere in the form of CO2.

Lastly, deforestation reduces the number of trees that absorb CO2 for photosynthesis, consequently resulting in higher carbon dioxide concentrations in the air, as less CO2 is being removed.

To summarize, respiration, combustion, decomposition, and deforestation all contribute to the addition of carbon dioxide to the atmosphere.