This paper addresses the dual challenge of enhancing fire resistance and reducing the carbon footprint of concrete structures, motivated by the increasing prevalence of Li-ion battery-powered electric vehicles. The study aims to evaluate the impact of intensified fire loads on reinforced concrete and assess environmentally sustainable concrete formulations. Experimental methods were applied to analyse various concrete mixes’ fire performance and CO₂ emissions, including geopolymer alternatives and recycled aggregates. Results demonstrate that reformulating the concrete mix can reduce CO₂ emissions by approximately 10% while maintaining structural integrity. The findings highlight the importance of balancing fire safety and sustainability, offering practical insights for future tunnel design and aligning with the interdisciplinary scope of cognitive mobility research. The changing nature of fire and recent significant changes in concrete technology are potential sources of danger. Electric vehicles pose an external fire risk because of the batteries they contain. When Li-ion batteries are burning, the typical fire load curve rises significantly steeper and reaches a higher final temperature than the normal (in high-rise buildings) fire load curve, which poses a much greater risk to our structures. In addition, the strength of concrete increases, resulting in a more compact structure. Stress usually causes surface delamination of high-strength concrete due to increasing temperatures. In addition to all this, environmental protection has also come into focus. New requirements are imposed on structures, such as the lowest possible carbon dioxide emissions. In addition to fire resistance tests, the CO₂ emissions of concrete have been determined. The analysis showed that by changing the formulation, 10% of CO₂ emissions can be saved. High CO₂ concretes resist fire better, but greener mixes require design adaptations.