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GREET underestimates indirect land use change, undermining the climate benefits of section 40B
The policy brief contends that the GREET model's outdated assumptions regarding land displacement and forest impacts lead to a significant underestimation of indirect land use change (ILUC) emissions for sustainable aviation fuel (SAF). This discrepancy allows high-emissions fuels, particularly land-intensive soy and corn biofuels, to qualify for the section 40B tax credit, which the author argues distorts the market against waste-based and synthetic SAF and contradicts congressional intent. The document advocates for updating GREET to a methodology similar to the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), which incorporates a broader range of ILUC values to better reflect global market impacts.
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Document type: Policy brief