The process of the formation of food by trapping the sunlight with the help of chloroplast is called photosynthesis.
These are the following which are used in process photosynthesis:-
-Carbon dioxide
-Water
-Sunlight
Photosynthesis is greatly dependent on the amount of carbon dioxide concentration in the atmosphere because photosynthesis is the process where carbon dioxide gas is used in large amounts.
If the vegetation occurs higher in the season, the decrease will occur in the carbon dioxide concentration of the atmosphere while on the other hand, if less vegetation occurs then there is a higher amount of carbon dioxide concentration in the atmosphere.
Hence, the larger the amount of carbon dioxide more the yield from photosynthesis. In some cases, the high amount of carbon dioxide also acts as a poison.