Plants absorb carbon dioxide (CO2) from the atmosphere through small openings in their leaves known as stomata. This gas is a key component in the process of photosynthesis, where plants convert sunlight, water, and carbon dioxide into glucose and oxygen. During photosynthesis, plants store energy by converting carbon compounds, essential for their growth and development. The oxygen produced during this process is released back into the atmosphere, which is crucial for the survival of aerobic organisms, including humans. Thus, the absorption of CO2 by plants plays a vital role in the Earth's ecosystem and climate regulation.