Economic, climate and other effects of 1-2 nuclear expolsions

Factual Questions
1

Looking at the N Korean stand-off I wondered if, living in Europe, I will be affected by a possible nuclear explosions?
You can find online some information on immediate effects of dropping a A/H-bomb, or effects of a nuclear war, or even a limited nuclear war (Climate threat from nuclear bombs | Environment | The Guardian) but what about a more likely event like a short nuclear exchange between North Korea and the US? I mean one or two explosions.
Will it have any long-lasting effects on the markets? Will it affect global agriculture? What about global climate change?

2

Totally depends on the yield of the bomb, whether they’re air or ground bursts, and where in America the one from North Korea is detonated.

3

First of all, if NK nukes the USA, the response is not going to be one or two explosions. The USA will feel the need to demonstrate a zero tolerance policy towards having it’s people vaporized. I would guess that they would respond with dozens, maybe hundreds of nukes. Enough to annihilate North Korea as a nation.

Some - many - of these nukes would be groundbursts, as there are military emplacements up and down the DMZ that would need to be eliminated. Also, each facility thought to be involved with nuke production would be eliminated. And of course every significant concentration of people.

There would be a very significant fallout cloud, and would kill some people in South Korea and China who were unlucky enough to be downwind. Fortunately, fallout actually reduces in radioactive intensity extremely rapidly - by the time it reached you in Europe, it would be far less radioactive and far more spread out.

It would cause catastrophic changes to stock prices. They’d probably just close the markets for a few months. Global agriculture would be affected in that some crops and livestock would be contaminated with fallout - especially in China and South Korea - and would have to be destroyed. This in turn would increase demand for food imports to that region of the world, increasing global prices for food.

Climate would be unaffected, I think.