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I mean, why not solve one with the other?

If we can terraform Mars by nuking the poles, maybe we can use nukes to trigger huge volcanic eruptions that will cause global cooling by putting tons of dust into the atmosphere

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Are you being facetious? How many people do you think would be killed by a nuclear blast of that size? How many more would die in agonizing pain as the fall-out spread over the globe? How many more from horrible cancers forty years from now? A volcanic eruption of that size would destroy agriculture and cause most of Africa, much of Asia, much of South America, and probably good chunks of North America and Europe to starve. It would also send ash contaminated with nuclear fall-out into the atmosphere.

No, the nuclear blast would be underground in the remote Pacific away from civilization, just enough to trigger a massive ash cloud to cool the earth.

I though ocean warming was enough of a problem as-is? Many thermo-nuclear weapons can reach temperatures exceeding one hundred-fifty million degrees. Also, that would probably wipe out the entire Pacific rim with colossal tsunamis. The radioactive fallout would then be carried throughout the world by currents, percolate throughout the ecosystems, and poison every one.

Nukes are not that powerful. See: https://what-if.xkcd.com/15/

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