Actually I was talking to a DHS planner about what would happen with an unknown "blight" of corn or wheat. An unexpected genetic drift in hybrids or a unknown/unexpected insect outbreak could wipe out harvests unlike anything in the past (it makes ag people nuts). I'm outside my area of expertise but I believe the issue is called something like uni-crops or something like that. The normal bio-diversity of crops isn't being done like it was in the past and the result is a larger volume of the harvest is effected by any single event since "everybody" is growing "everything" alike. The hybrid nature of some crops and a lack of multiple crops seems to be the issue.
Then there is salination of soil due to improper irrigation.
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