Assuming a setting depicted in GURPS Terradyne and advancing it forward, say transportation TL 10, what would be the best source of hydrogen for terraforming Venus? It would take about 4×10^19 kg of hydrogen to convert the whole Venusian atmosphere. Moons and planetary rings cannot be exploited due to the ExPERt Act of 2051. Would comets be the best source of hydrogen? What about removing hydrogen from the atmosphere of Jupiter? Thanks, in advance, for your helpful comments.
The Anime "Venus Wars" suggests that an "accidental" comet collided with Venus and "blew off" much of the atmosphere, and added millions of tons of water, making it breathable...
Terraforming problems, however, are one of the minor plot points.
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