Disaster Planning
If Yellowstone park does actually erupt and cover half the country in a bunch of hot ash, it'll most likely end up doing that to the portion of the country that makes food (specifically the part that grows corn). I don't know what kind of remediation would be needed to recover soil that's been volcanically affected for purposes of growing crops, but if a big eruption does occur, it's going to be a world of hurt - a real global food crisis, and then a whole bunch of global cooling that might make growing crops more difficult.
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