Stakeholders and key oil companies gathered in Berlin, Germany for the DECARBON 2025 Congress to discuss sustainable energy transition strategies. Central themes included reducing carbon footprints, hydrogen production, refining advancements, and circularity principles. The congress highlighted Carbon Capture Utilisation and Storage (CCUS) for a lower-carbon future, decarbonisation trends in oil and gas, and predictive maintenance. A key discussion centered around hydrogen's role in achieving net-zero emissions, emphasizing large-scale renewable hydrogen plants and carbon capture technologies. Key insights included integrating onshore and offshore hydrogen grids, the importance of catalyst technologies in the chemical industry's ecological shift, and circularity principles for decarbonisation progress. The event concluded with discussions on the downstream sector's decarbonisation, water management, e-fuels production, and biorefinery technologies. Speakers stressed the urgency for new process technologies, novel catalyst materials, and the optimization of industrial equipment for energy efficiency and reliability.