Plants depend on the atmosphere for the largest source of carbon (CO2). Carbon is a vital element required by plants for photosynthesis, the process by which they convert sunlight into food or energy. Plants have tiny pores called stomata on their leaves or stems through which they exchange gases with the atmosphere. Atmospheric carbon dioxide enters through the stomata, while oxygen and water vapor are released. Inside the leaf, carbon dioxide reacts with water and energy from the sun to produce glucose and oxygen through a series of reactions known as the Calvin Cycle. Glucose serves as the primary source of energy for plants, while oxygen is released into the atmosphere. Therefore, the presence of carbon dioxide in the atmosphere is crucial for plant growth, biomass production, and the entire ecosystem's sustenance and functioning.