For a long time in the past, the content of carbon dioxide in the atmosphere has remained basically constant, because the carbon dioxide in the atmosphere has always been in a dynamic equilibrium of growth and consumption  80% of the carbon dioxide in the atmosphere comes from the breathing of people, animals and plants, and 20% comes from the burning of fuel  75% of the carbon dioxide scattered in the atmosphere is absorbed and dissolved in water by surface water and air precipitation such as oceans, lakes and rivers  Another 5% of carbon dioxide is converted into organic matter for storage through plant photosynthesis  This is why carbon dioxide accounts for 0
03% (volume fraction) of the air over the years
Sources of carbon dioxide in the atmosphere.