More than 100 years ago, Earth's atmosphere contained about 280 parts per million (ppm) of carbon dioxide. It is predicted that by the year 2050, the level of carbon dioxide in the atmosphere could reach 700 ppm, greatly increasing Earth's temperature. It has been suggested that growing more green plants would help to slow this increase. The best explanation for why increased numbers of plants would help is that plants

Photosynthesis converts light energy by phototrophs into chemical energy, then used for cellular power activities.
Sugars, formed from water and carbon dioxide, store chemical energy.

How do plants use CO2 in photosynthesis?

Plants fix atmospheric CO2 to store energy as carbohydrates.
In the dark reaction of photosynthesis, carbon dioxide is assimilated.
CO2 is used in the carboxylation of ribulose bisphosphate during carbon fixation (RuBP).
The reaction is catalyzed by the enzyme RuBisCO and is the first step in the Calvin cycle.
It produces two molecules of 3-phosphoglyceric acid (3PGA), which is then reduced in a series of reactions to produce glucose, and RuBP is regenerated.

Thus, we can conclude that during photosynthesis, plants use CO2 and reduce CO2 from the environment. Therefore, afforestation should be done.

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