The document discusses hydrogen as an alternative fuel source. It notes that while hydrogen fuel cell vehicles currently make up a small portion of vehicles, hydrogen has advantages over electric including high energy density and ability to be stored and delivered via pipelines. However, hydrogen also has disadvantages like high production costs if produced from green electricity and need for more fueling stations. The document advocates for hydrogen as a way to achieve zero emission energy independence in the EU and decarbonize transportation, but notes challenges to widespread adoption. Controllers are advised to analyze how hydrogen could impact emissions and product costs over time as production prices potentially decrease.