Consider the following materials: 1. Agricultural residues 2. Corn grain 3. Wastewater treatment sludge 4. Wood mill waste. Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?

All four materials can be used as feedstock for producing Sustainable Aviation Fuel (SAF). SAF can be produced from a wide variety of biological and waste-derived feedstocks including agricultural residues (crop stubble, husks), corn grain (via alcohol-to-jet pathway), wastewater treatment sludge (via thermochemical conversion), and wood mill waste/forestry residues (via gasification or pyrolysis). The diversity of feedstocks is essential to scale SAF production sustainably while reducing aviation's carbon footprint. SAF can reduce lifecycle emissions by up to 80% compared to conventional jet fuel.