TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The method of degrading a cellulosic material further comprises treating the cellulosic material with a chemical pretreatment, a physical pretreatment, or a chemical pretreatment and a physical pretreatment. The pretreating with the one or more GH61 polypeptides is performed before, during, or after the chemical pretreatment, the physical pretreatment, or the chemical pretreatment and the physical pretreatment. One or more GH61 polypeptides are inactivated following pretreatment of the cellulosic material. The enzyme composition comprises one or more enzymes selected from a cellulase, a GH61 polypeptide having cellulolytic enhancing activity, a hemicellulase, an esterase, an expansin, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin. The method further comprises recovering the degraded cellulosic material. Producing a fermentation product, comprises (a) pretreating a cellulosic material with a composition comprising one or more GH61 polypeptides; (b) saccharifying the GH61 pretreated cellulosic material with an enzyme composition; (c) fermenting the saccharified cellulosic material with one or more fermenting microorganisms to produce the fermentation product; and (d) recovering the fermentation product from the fermentation. The method further comprises treating the cellulosic material with a chemical pretreatment, a physical pretreatment, or a chemical pretreatment and a physical pretreatment. Producing a fermentation product, comprises (a) saccharifying a cellulosic material with an enzyme composition, where the cellulosic material is pretreated with a composition comprising one or more GH61 polypeptides; (b) fermenting the saccharified cellulosic material with one or more fermenting microorganisms to produce the fermentation product; and (c) recovering the fermentation product from the fermentation. The method further comprises treating the cellulosic material with a chemical pretreatment, a physical pretreatment, or a chemical pretreatment and a physical pretreatment. The method of fermenting a cellulosic material further comprises treating the cellulosic material with a chemical pretreatment, a physical pretreatment, or a chemical pretreatment and a physical pretreatment. Fermenting of the cellulosic material produces a fermentation product. The method further comprises recovering the fermentation product from the fermentation. EXAMPLE - No suitable example given.