Plants absorb carbon dioxide from the air, during the process of photosynthesis. Carbon dioxide diffuses through the small holes (stomata) present on the lower side of leaves. Owing to these loose-fitting cells on the lower side of a leaf, carbon dioxide can easily penetrate and reach other types of cells.
The stomata open wider to let in more carbon dioxide when they are exposed to harsh, drying effects of direct sunlight. Aerosols and clouds scatter sunlight in the atmosphere; this scattered sunlight helps forests and vegetation to absorb atmospheric carbon dioxide more efficiently. More leaves of trees are exposed to scattered sunlight, thereby increasing the rate of carbon dioxide absorption and photosynthesis.
Forests have become extremely important as they remove carbon dioxide from the atmosphere and mitigate the effects of climate change in the environment. During the process of photosynthesis, atmospheric carbon dioxide is converted into sugar and cellulose; this sugar is stored in the wood, leaves and roots of trees. Trees are 50 percent carbon by weight, so growing trees can help in reducing greenhouse effect of increasing atmospheric carbon dioxide.Learn more about Botany