VIWhile humans, animals, and factories emit CO2 (carbon dioxide) and plants absorb it. Plants keep the earth cooler, provide food, shelter people and animals, and make the world a better place. At the chlorophyll seeds on the leaves, the chlorophyll receives sunlight for photosynthesis. Leaves are the main part of the plant’s food production: absorbing energy from the sun, and converting water and CO2 into sugars and starches, which in turn become food to help plants grow, flower, and bear fruit. Do you know: the tiny holes are the way for oxygen and CO2 to come in and out, on the leaves of plants.