A tree captures carbon through the process of photosynthesis. During photosynthesis, the tree absorbs carbon dioxide from the air through tiny openings called stomata on its leaves. The carbon dioxide is then used in a chemical reaction with water and sunlight to produce glucose, a type of sugar, and oxygen. The glucose is used by the tree as an energy source and some of it is stored in the tree’s tissues, including its trunk, branches, and roots. This process removes carbon from the atmosphere and stores it in the tree, effectively capturing it.