Michael Liebreich, a long-time leading expert on financing clean energy and transportation, is adamant: green liquid hydrogen will not be carried round the world by ships, as the economics do not make sense.

His extensive career includes earning a master’s degree in engineering from the University of Cambridge, founding New Energy Finance and continuing on as chief executive for five years after it was acquired by Bloomberg, and being on the high-level advisory group for the United Nations secretary general’s Sustainable Energy for All initiative.