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It is presumed that the most northerly regions of those belts are still as productive, because they are now closer to the center of the belt instead of the edge ... This would imply that the southerly regions have become unsuitable for farming those crops, but that the belt now slips northward, making areas that were previous ABOVE the belt to now be arable and conducive to farming that crop ....
In other words ... The farmland lost in the south will become farmland gained in the north, with a 'near' net zero impact on the overall arable area available .... ('Near' net zero = having to shift farm resources northward).
Not saying this is a boon ... Just that it is more of a shift than a complete loss .... right ?
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