Ask any promoter of a new energy technology and the chances are they will pitch their own business as the single solution to all problems. But hydrogen evangelist Catherine Sheridan deliberately doesn’t, as I remarked to her after listening to the broad-reaching talk she gave at the recent Wind Energy Ireland conference. “There is no silver bullet. And anybody who says there is is either oversimplifying, or they don’t understand the situation we find ourselves in,” the chief operations officer of Cork-based company EI H2 tells me on this week’s podcast. Instead, she presents the production of hydrogen fuel as…