Edit: Thanks for all the answers and the effort to answer this trendy “sciency” question.
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Green Hydrogen is Hydrogen (a flammaboe gas) created from renewable sources. For example using the wind to make electricity and use that to electrolyze water (split H2O into hydrogen and oxygen)
It can be used as a fuel in specific kind of fuelcells that turns it back to electricity, so it can power cars and similar things. It can also be used to store energy (wind energy isn’t reliable, you need a way to store some for later when no wind blows). Also a few industries could use hydrogen in their processes directly to replace things that are bad for climate (hydrogen based steel making is currently being developed)
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