Biomass-based energy has become a focus of industry and policy makers in recent months. Much of this focus is being placed on energy and products derived from wood, both short-rotation crops and traditional forest resources. At its heart, wood is a concentrated form of stored sunlight (solar energy). This energy can be released and used as a fuel. Wood has always been an important source of energy for people. Today, wood is the most important source of renewable energy in the United States and a primary source of fuel for much of the world. Whether it is as simple as a campfire, or as sophisticated as producing ethanol, wood has a number of inherent advantages that ensure it will continue to be an important bio-fuel in the future.