I object to this line. Once the fires are out rebuilding can begin and I strongly suspect most people will rather rebuild than take their chances trying to travel far, which limits the assumed refugee crisis. Even with a 20% drop in population from all causes (not just the bombs, as noted by
@theflyingmongoose), that's still 80% of China still alive and doing its thing. To be sure it's a huge blow to any nation, but believe it or not, it's not something China hasn't dealt with before. I fully agree it's going to be a couple of decades for the Chinese economy to surpass its 1970 GDP, but no more than that. The rest of the post is entirely reasonable as far as I'm concerned.