What is green hydrogen, how is it made and will it be the fuel of the future? ABC Business 22/01/2021 By technology reporter James Purtill Abundant, cheap and clean-burning, hydrogen has long been described as the fuel of the future. That future has never quite materialised, however, due to hydrogen's disadvantages. It's difficult to transport, it can make metal brittle and it's 20 times more explosive than petrol. But in recent years, "green hydrogen" — hydrogen made without fossil fuels — has been identified as the clean energy source that could help bring the world to net-zero emissions. Billions of dollars of investment capital and taxpayer support has flowed into the industry, and company share prices have soared.