The MV Glen Sannox, a new dual-fuel ferry for the Arran route, is projected to emit more CO2 annually than the older MV Caledonian Isles, despite being marketed as environmentally friendly. Emission analyses reveal a greater carbon footprint, attributed to its larger size, fuel consumption, and methane emissions. Critics argue that the true environmental impact of the LNG fuel has been underestimated, suggesting a potential return to diesel may be more efficient given the broader emissions associated with LNG transport. Experts call for a more holistic evaluation of ferry emissions.