How long does the world's current grey hydrogen production fleet have left on average? And why do autothermal reformers with carbon capture and storage appear to be the replacement technology of choice for low-carbon hydrogen producers? In this episode of the ICIS Hydrogen Insights podcast, hydrogen editor Jake Stones discusses these matters and more with Johnson Matthey's senior vice president of hydrogen and sustainable technologies, Dr Eugene McKenna.  Dr McKenna also gives his take on the prospect of retrofitting steam methane reformers with CCS, and the risks facing hydrogen market participants today when developing their projects.