Thoughts about "nuclear winter"

Excerpts from a blog post written by a world-famous man -

I feel embarrassed to be unaware of the subject, one that I have not even heard mentioned before. On the contrary, I would have understood much earlier that the risks of a nuclear war were far more serious than I imagined. I assumed that the planet would be able to withstand the explosion of hundreds of nuclear bombs calculating that, in both the United States and the USSR, countless tests have been carried out over the years. I had not taken into account a very simple reality: it is not the same thing to explode 500 nuclear bombs over 1,000 days as it is to do the same thing in one day...

A nuclear conflict between the two weakest nuclear powers would be sufficient, such as India and Pakistan – who nevertheless possess far more than 100 weapons of this kind – and the human race would disappear...

"The only way to eliminate the possibility of a climatic disaster is to eliminate nuclear weapons."

I'm not going to use this post to discuss the validity of the observations, but rather to reflect on the fact that these thoughts are expressed by a man who for the last 50 years has been a world leader.  I never knew that he was now a blogger.  This is his signature:
 
His name is easier to read at the link.  You'll be surprised...