Why Hydrogen Transit Often Emits More Than Diesel Once You Count Everything - CleanTechnica

The article from CleanTechnica highlights a critical issue with hydrogen transit systems: while hydrogen fuel cell buses emit only water vapor at the tailpipe and are often labeled as zero-emission vehicles, their full lifecycle emissions—including hydrogen production, processing, transport, storage, refueling, and leakage—can be comparable to or even exceed those of diesel buses. This discrepancy arises because hydrogen is not a naturally occurring fuel and requires energy-intensive manufacturing, often from carbon-intensive electricity grids. The common practice of focusing solely on tailpipe emissions has led to a misleading perception of hydrogen transit as a climate-friendly solution, influencing policy, funding, and public messaging without accounting for upstream emissions. The article further explains that the carbon intensity of the electricity used for electrolysis is a major factor in hydrogen’s overall emissions. On grids dominated by fossil fuels, hydrogen production can result in well-to-wheel emissions several times higher than diesel. For example, electrolysis powered by electricity with 400 to 700 g CO2e per k