Judging by what has been posted on this thread very few people bothered to read the link supplied by BB.

The premise of the article is for two countries each to lob 50 nuclear warheads at one another. This will not cause the much feared nuclear winter that could destroy mankind, but still 3 million to 17 million deaths cannot be dismissed too lightly. The only trouble with the "model" the article is based on is that apart from the "big five" no two sides of the newbies (North Korea - possible; Iran - potential; Israel - possible; Pakistan - definate and India - definate) actually have 50 nukes to throw at one another.

And yes Paul did make a couple of very good points and the questions asked remain unanswered:

Have Hiroshima and Nagasaki recovered?
Yes they have, I have travelled to both and worked in Nagasaki. At no time was I advised not to drink the local water, at no time was I told not to eat local produce, at no time was I advised to wear a mask as local dust particles may be dangerous.

How many atmospheric nuclear tests have been carried out?
I would estimate that between 1945 to 1980 there have been something like 560 atmospheric tests of nuclear weapons. I say estimate because I have not been able to get any information regarding the number of Russian and French atmospheric tests. The US, UK and USSR stopped atmospheric testing in 1963, the French in 1974 and the Chinese in 1980. The largest atmospheric test was carried out by Russia when it tested a 50 megaton yield weapon.

I would still stand by what I said and the article tends to agree with me - "Where it becomes dangerous is if someone believes that a nuclear war is viable."