{"query_echo":{"q":"","filters":{"analysis_type":["comparative methodology assessment"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'comparative methodology assessment' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":1,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=comparative+methodology+assessment","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"catf-000448","url":"https://climateinsightsdirectory.org/document/catf-000448","title":"GREET underestimates indirect land use change, undermining the climate benefits of section 40B","publisher":{"name":"Clean Air Task Force","organization":"clean-air-task-force"},"document_type":"policy brief","language":"en","date_published":"2024-04-05","source_url":"https://www.catf.us/2024/04/greet-underestimates-indirect-land-use-change/","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"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policy brief contends that the GREET model's outdated assumptions regarding land displacement and forest impacts lead to a significant underestimation of indirect land use change (ILUC) emissions for sustainable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.","ai_generated":true,"unit":"catf-000448#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The GREET model is not similar to the CORSIA methodology and underestimates indirect land use change (ILUC) emissions because it uses a less rigorous module with outdated assumptions about land displacement and the impact of crop production expansion on forest lands.","ai_generated":true,"unit":"catf-000448#insight-1","date_modified":"2026-10-23"},{"text":"Using GREET 2022 ILUC values creates a market distortion that favors low-cost, land-intensive conventional biofuels derived from corn and soy over synthetic SAF and waste-based fuels, while also reducing incentives for ethanol producers to implement carbon capture.","ai_generated":true,"unit":"catf-000448#insight-2","date_modified":"2026-10-23"},{"text":"A comparison of a soy-based SAF producer shows that using GREET 2022 results in a lifecycle emission total of 47.3g CO2e/MJ (a 50% reduction vs fossil jet fuel), whereas CORSIA's higher ILUC rate results in 64.3g CO2e/MJ (a 30% reduction), meaning the producer might qualify for the section 40B tax credit under GREET but not under CORSIA.","ai_generated":true,"unit":"catf-000448#insight-3","date_modified":"2026-10-23"}],"climate_tags":["Sustainable Aviation Fuel","biofuel","carbon capture and storage","climate finance"],"geography_discussed":["United States"],"frame_perspective":[],"analysis_type":["policy analysis","comparative methodology assessment"]}]}