TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Microorganism: In the microorganism, the microorganism is a member of a genus selected Clostridium, Zymomonas, Escherichia, Salmonella, Rhodococcus, Pseudomonas, Bacillus, Lactobacillus, Enterococcus, Alcaligenes, Klebsiella, Paenibacillus, Arthrobacter, Corynebacterium, Brevibacterium, Pichia, Candida, Hansenula and Saccharomyces. The microorganism is a member of a species selected from Escherichia coli, Aspergillus eutrophus, B. licheniformis, P. macerans, R. erythropolis, P. putida, L. plantarum, E. faecium, E. gallinarium, E. faecalis, B. subtilis, S. carlsbur genesis and S. cerevisiae. The microorganism is a Saccharomyces species. The microorganism is a S. cerevisiae. The cellulase enzyme is selected from endoglucanase, exoglucanase and beta-glucosidase. The cellulase enzyme is selected from: endoglucanase II, cellobiohydrolase II, and beta-glucosidase I. The microorganism comprises heterologous genes that encode endoglucanase II, cellobiohydrolase II, and beta-glucosidase I. The endoglucanase II and cellobiohydrolase II genes are from Trichoderma reesei and the beta-glucosidase I gene is from A. aculeatus. The butanol biosynthetic pathway gene is selected from acetyl-CoA C-acetyltransferase (thiolase), 3-hydroxybutyryl-CoA dehydrogenase, 3-hydroxybutyryl-CoA dehydratase (crotonase), butyryl-CoA dehydrogenase, butyraldehyde dehydrogenase, and butanol dehydrogenase. The butanol biosynthetic pathway gene is from a solventogenic bacteria. The solventogenic bacteria are C. acetobutylicum. The competing product pathway has been disrupted. The competing product pathway is an ethanol pathway. The ethanol pathway is disrupted by inactivating one or more alcohol dehydrogenases. The gene that encodes the laccase polypeptide is the POXAIb gene from Pleurotus ostreatus. The pentose sugar is xylose. The polypeptide involved in the fermentation of xylose is a xylose isomerase. The xylose isomerase genes are from Piromyces sp. The polypeptide involved in the fermentation of xylose is a xylose reductase or a xylitol dehydrogenase. The microorganism comprises heterologous genes that encode a xylose reductase and a xylitol dehydrogenase. The xylose reductase and xylitol dehydrogenase genes are from Pichia stipitis. Preferred Method: Producing butanol further comprises isolating the butanol that is produced. EXAMPLE - No suitable example given.