If Yellowstone’s volcanic system erupted, how could it impact the US?
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Why worry? If it goes, the world will be significantly impacted as will the entire human race. As for the US, it would be a write off.
Buy masks by the car load, they can be entombed with you when feet of rock ash falls, night descends for several years, and there is no food, water, or usable shelter.
At least gun control will be gone.