[laplata]

It would take several dozen such explosions to come close to the effect described.

><

Or one huge solar flare. Then the side facing the sun is affected.

[Hawthorn]

>> one huge solar flare. Then the side facing the sun is affected <<

Maybe so. But even then, destruction of approximately one-half of the world’s productive capacity could set back the other half of humanity by maybe as much as hundred years.