**[Brazil's Petrobras Adopts Cardano to Track Sustainable Fuels]** According to Deep Tide TechFlow on October 1, as reported by Cointelegraph, Brazil's state-owned oil company Petrobras announced the development of two applications using the Cardano blockchain to track sustainability data for Sustainable Aviation Fuel (SAF) and Renewable Diesel (Diesel R). This initiative is the result of a research collaboration between the company and PUC-Rio's Ledger Labs since 2023. One application for Sustainable Aviation Fuel adopts the Book-and-Claim model, leveraging tokenized environmental attributes to ensure carbon reduction benefits are not double-counted or misused. The other application establishes digital checkpoints for Renewable Diesel, aiming to track its production and transportation processes, thereby supporting the company's Scope 3 indirect emissions reporting. As of now, the project team has not disclosed the specific scale of fuel coverage or a timeline for large-scale deployment.