Biologically, plants and other photoautotrophs extract the carbon from the atmosphere and use it for the construction of their body parts through the process of photosynthesis so Earth likely wouldn't have a present-day biosphere without atmospheric carbon dioxide.
Plants extract the carbon from the atmosphere. This is biologically. Other photoautotrophs extract the carbon from the atmosphere. This is biologically. Plants use it for the construction of their body parts through the process of photosynthesis. This is biologically. Other photoautotrophs use it for the construction of their body parts through the process of photosynthesis. This is biologically. Earth likely wouldn't have a present-day biosphere without atmospheric carbon dioxide.