There was some discussion about hydrogen's potential as a major source of "clean" fuel in future. The Committee notes that aspects of this technology remain developmental, with questions over how clean it is, the situations where it can best be deployed and whether its role may be mainly transitionaliNet Zero, Energy and Transport Committee, Official Report, 26 April 2022, Col 48 - 49, Official Report, 19 April 2022, Col 19 and Friends of the Earth Scotland.