“The cooling will start within the advertised shelf-life of the product, and when it does, worldwide food production will drop substantially. “
Yes. I have read several reports of ice core analysis that suggest that an ice age can start in just a couple of hundred years or even a couple of decades. That’s the really scary climate change, not the one where farmers can grow bananas in Arkansas.
Sometimes the onset is obvious after only a couple of years:
https://en.wikipedia.org/wiki/Great_Famine_of_1315%E2%80%9317