12/12/2023 0 Comments Aj transport inc![]() ![]() Put bluntly, this shortcoming could "negate the entire climate benefits and even increase emissions several-fold compared to fossil jet fuels," according to EDF. GREET risks "inaccurate accounting," which could incorrectly give GHG emissions reductions credit where credit is not due, he said. There are significant drawbacks to the GREET model, according to Andrew Chen, principal for climate-aligned industries at RMI. CORSIA accounts for a more robust life-cycle emission inclusive of land use changes and would not allow subsidies for SAF grown on certain converted wildlands. This is because SAF producers can use feedstock from land farmers converted from wildland or wetland into agricultural land. Gevo said subsidies calculated under GREET are easier to get than under CORSIA. Gevo, an ethanol producer, told E&E News it plans to produce 1 billion gallons of SAF annually in 2030, one third of the 3-billion-gallon goal set by President Joe Biden's administration for the amount of SAF to be produced annually by the end of the decade. Some producers of agriculturally derived SAF claim they could roduce more aviation fuel faster if the production was subsidized using the GREET methodology, rather than CORSIA. ![]() Finally, the GREET model is already used for other federal tax credit programs related to biofuels, proponents argue. The senators suggest GREET is superior because it uses newer data, noting that CORSIA relies on outdated metrics from a previous iteration of GREET. On the other side, SAF producers claim the GREET model is more accurate than CORSIA because it allows them to claim GHG benefits from agricultural innovations. In public comments to the Treasury Department, the NGO refers to GREET as "an analytical tool, not a methodology." ![]() In short, the model is less stringent than the U.N.’s CORSIA model, according to EDF. Tammy Duckworth (D-IL) in June wrote a letter to the Treasury Department and co-sponsored a bill that would make GREET the official methodology for calculating the subsidy. But SAF producers and industry allies wanted them based on the GREET model. CORSIA offers a certification that proves a fuel has followed a sustainable process, which GREET does differently, and less effectively, according to environmental groups.Īs of right now, the federal government requires the use of CORSIA to calculate IRA tax credits for the use of SAF. The two primary options today are Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), developed by the United Nations International Civil Aviation Organization, and Greenhouse Gases, Regulated Emissions and Energy use in Transportation (GREET), advocated by the Department of Energy and industry.īoth calculate SAF life-cycle emissions reductions but differ in how they account for GHG emissions produced by land use change. How that impact is calculated depends on which accounting methodology is used. If land is converted to grow more SAF feedstock, the conversion releases greenhouse gases (GHG) and damages ecological diversity, according to the High Integrity SAF Handbook, published by the Environmental Defense Fund. The concern stems from the food security challenges posed by growing crops for fuel. The divide is largely over whether SAF derived from corn-based ethanol and other agricultural crops should qualify for a tax credit created by the Inflation Reduction Act (IRA).Ĭurrently, most SAF is produced by treating waste, cooking oil, animal fats and byproducts - those processes are not what’s at issue. senate legislation announced last month and recent Department of the Treasury regulatory comments illustrate a behind-the-scenes argument simmering between sustainable aviation fuel (SAF) producers and environmental groups. ![]()
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