James Carton, assistant professor in Sustainable Energy with DCU and an academic advisor to the United Nations on hydrogen, joins us on this week's podcast to discuss this lesser spotted energy source. How do you make it? Where could it be used instead of fossil fuels? Could it be part of a clean energy future, or does it amount to simply greenwashing?The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/