Plants use sunlight energy to take carbon dioxide and water molecules are rearrange them to make oxygen gas and glucose, which stores the energy. Animals/Humans “burn” the glucose using oxygen, and then we help to recycle the carbon dioxide and water when we breathe out. So why does the sun have to keep supplying more energy? Why isn’t the energy also recycled when the atoms are recycled? Use R. A.C. E.S format.