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> Hydrogen fuel cells are not a source of energy, since hydrogen (H2) is not naturally found on Earth. All H2 must be generated in a process which consumes either natural gas or eletricity. Therefore H2 fuel cells are more aptly described as an energy storage system than as an energy source.

100% this.

IMHO, this is by far the biggest misconception about hydrogen among people.

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Not actually true. H2 is found naturally, although we don't have an good assessment how much exists or whether there are significant deposits.

To my understanding, natural discoverability of H2 gas on earth surface is very low due to the gas being very light and buoy itself up the atmosphere, possibly escape the planet entirely.

Hydrogen is being created and consumed on a vast scale on Earth. The possibility that there are huge pockets of hydrogen gas trapped under impermeable rock layers cannot be ruled out. For one thing, natural gas pretty often contains hydrogen as a constituent.

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