While South Africa and the world are in the nascent stages of using sustainably produced, or green, hydrogen as an energy carrier, there are many projects across the emerging value chain highlighting opportunities for role-players at local and international level. Experts participating in a 'Green Hydrogen: Policies to expand investment in this new clean energy source' webinar, hosted by Engineering News publisher Creamer Media, on April 19 detailed some of the challenges facing the green hydrogen sector locally.