Where are you getting the bolded info from?
I also don't agree with your statement that data from Volcanic eruptions only covers a few hundred years. We know Yellowstone's history for the past 2 million years. We know about the Toba eruption that caused a massive bottleneck in human population...
I believe I heard that it naturally exists in space.
So it is a matter of finding a way to harvest it whilst travelling in space and then use it as a fuel.
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