[Windflier]

That should block out more of the sun and ease global warming.

If Katla blows, the reduced sunlight could affect crop production, worldwide. Stock up on those can goods.

[unkus]

Any ideas on how long crop production would be affected?

Best to add to one’s existing stocks of food starting right now.

[MaxMax]

I'll be hitting the store tomorrow and stocking up on sale items.
Usually I give the items a month away from expiration to the food bank
to keep a good rotation. Although many items can be stored beyond the dates.