Cellulosic ethanol is an alcohol made from biomass such as wood and agricultural residues (instead of the starches which are used to produce corn/grain ethanol). The difference between starch and cellulosic ethanol start with the plants. In the United States, starch ethanol is made from corn kernels. Cellulosic ethanol, however, starts with cellulose, the most abundant carbon-containing material on the planet and something found in virtually every natural, free-growing plant, tree, and bush in the world. Some cellulosic ethanol processes use all the carbon in the plant matter to produce ethanol. The process to make cellulosic ethanol is more complicated than the process to make corn ethanol. While the starch ethanol industry has been around for many years, the cellulosic ethanol industry is fairly new and still being developed. There are many new processes and companies examining the industry and it is positioned to grow greatly over the next several years.