Plants absorb carbon dioxide through a process called photosynthesis. This process occurs primarily in the leaves, where tiny pores known as stomata allow carbon dioxide from the atmosphere to enter. During photosynthesis, plants take in light energy—often from sunlight—which, alongside water absorbed by their roots, is used to convert carbon dioxide into glucose and oxygen. The glucose produced serves as food for the plant, while oxygen is released as a byproduct. This essential process not only sustains plant life but also plays a vital role in the Earth's ecosystem by regulating atmospheric carbon dioxide levels and producing oxygen.