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Ultimately it's a giant volcano that's going to eradicate anything within a few hundred miles with the force of a nuclear blast. As ridiculous as it sounds, if we can find a way to diffuse it that does a lot more for both the natural world, and for the humans that live in proximity to it.

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If the chances of that happening in the next 1000 years are one in a million, I would say it is absolutely not worth it.

Sure kick the can down the road ... just like the dinosaurs did.

Mitigating risk of an extinction level event from an asteroid seems much like a supervolcano. Sure the risk in any given year is low, but losing a 1-8 billion is a big loss, even if it's every few million years.

The risk that this happens until we have technical means of avoiding the ecological disaster that current proposals entail is orders of magnitues closer to zero than the next pandemic wiping 50% of humans off the earth within your lifetime. Have you proposed the next lock-down yet?

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