What would happen if ocean currents suddenly stopped (or changed)?

I'm thinking about a device (in a story I'm writing) that could control ocean currents, and I'm wondering how it could be weaponized. For example, if an ocean current was suddenly stopped, what might happen to the climate around it? Would stopping one ocean have a significant effect, or would it take stopping many/all?

Furthermore, what if an ocean current was reversed or shifted? Could it be used to cause a localized drought or freeze? Or otherwise severe, dangerous weather?

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What would happen if ocean currents suddenly stopped (or changed)?

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