CO2 is used by plants in the photosynthesis process to produce sugar and oxygen.
Animals utilise oxygen in their respiration process and produce more CO2.
Because CO2 quickly dissolves in water, the ocean is the primary regulator of CO2 in the atmosphere.
The greenhouse effect may be caused by an excess of CO2 in the atmosphere.
because of the combustion of fossil fuels, more CO2 is emitted into the atmosphere now than in the past.