Consider the following materials:

Correct Option

All the materials listed-agricultural residues, corn grain, wastewater treatment sludge, and wood mill waste-can be utilized as feedstocks for producing Sustainable Aviation Fuel (SAF). SAF is a renewable alternative to conventional jet fuel, derived from various biomass and waste resources. Its primary objective is to significantly reduce the life-cycle greenhouse gas emissions associated with aviation. The technological pathways for SAF production are diverse and capable of converting a broad spectrum of inputs, including agricultural by-products, energy crops, industrial waste, and municipal waste streams, into aviation-grade fuel.

Incorrect Options

Options 1, 2, and 4 are incorrect because they omit one or more viable feedstocks for SAF production.

• Option 1 (1 and 2 only) is incorrect as it excludes wastewater treatment sludge and wood mill waste, both of which are recognized feedstocks for SAF.
• Option 2 (3 and 4 only) is incorrect as it excludes agricultural residues and corn grain, which are widely used in biofuel production and increasingly for SAF.
• Option 4 (1, 3 and 4 only) is incorrect as it excludes corn grain, a significant source for bioethanol and a potential feedstock for SAF through various conversion pathways.