trees that have meant something special to us. We probably also have positive feelings about trees as we have learned how they contribute to mankind by providing oxygen, food, shelter, heat, medicines and aesthetic beauty. We may also know that they help prevent soil erosion, clean our air and water, and serve as “carbon sinks” by reducing carbon dioxide in the atmosphere and converting the carbon into their wood. But do we have a definition that is clear and decisive? Would your neighbors define “tree” in the same way that you do?