Carbon is very important in our world. Most of Earth's carbon All living things are made of carbon, is under the ground. It including us! Plants, animals, and people are comes from ancient plants and animals. People use about eighteen percent (18%) carbon. Where does carbon come from? All this carbon for energy to heat homes and to carbon came from stars like our sun. On power cars, trucks, and planes. Then it goes Earth, plants get the carbon they need from back into the air. Too much carbon in the air the air. Animals and people get the carbon can be bad for our planet. We need to use they need by eating plants or other animals carbon carefully.