Pine trees cover much of the Southeastern United States. When older pine trees are cut for making wood products, only the trees’ boles are used. The scientists in this study wondered if there might be a use for the trees’ crowns as well. In particular, they wondered whether the trees’ crowns might one day be a source of energy. Topics: Active Forest Management, Engineering and Forest Products, Energy, Fertilizer, Forest management, Modeling, Potential Energy, Tree Crown.