A type of biofuel that is produced from cellulose, hemicellulose, or lignin from plants to form cellulosic ethanol and Fischer–Tropsch fuels. They can be blended with petroleum-based fuels and combusted in modified internal combustion engines. Second-generation biofuels have been developed due to the limitations of first-generation biofuels, which have an impact on food production and biodiversity. Examples of the raw materials used include biomass from the non-food parts of crops, such as stems, leaves, and husks, as well as certain types of grass, fibre, and industry waste such as wood chips, skins, and pulp from fruit pressing.