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A Texas refinery, Diamond Green Diesel, is under scrutiny for sourcing cattle fat from illegally deforested Amazon lands, raising concerns about its sustainability claims. This refinery, a joint venture between Darling Ingredients and Valero Energy, has received over $3 billion in U.S. tax credits for biofuel production since 2022. Airlines like JetBlue and Southwest, which use this green fuel, face pressure to address their environmental impact amid allegations that the supply chain undermines their sustainable efforts and may violate Brazilian law.