What exactly is green hydrogen (and why does the colour matter)?
Believers are selling hydrogen as the key to the transition away from fossil fuels. But sceptics include Elon Musk and Saul Griffith.
Green hydrogen is being touted by some as the next big thing to fuel the world and save the environment at the same time.
Countries are pouring tens of billions of dollars into the technology that creates a carbon-free source of fuel, and it has an army of supporters, with high-profile iron ore miner and billionaire Andrew Forrest among them.
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