Hydrogen is the simplest element in the universe. And excitement is growing from nations and investors looking to harness its power to make clean, green energy. In this edition of Bloomberg Green, we speak to Australian billionaire Andrew Forrest about his big pivot from dirty coal to clean hydrogen. And Snam CEO Marco Alvera talks to us about his price target for the gas over the next decade. Plus, we break down the difference between gray, blue and green hydrogen, and speak to our BloombergNEF analysts about the possible limitations of the gas.