So you're saying this wouldn't have helped because only the industrialized countries would be using nuclear and that would still leave the industrializing count

So you're saying this wouldn't have helped because only the industrialized countries would be using nuclear and that would still leave the industrializing countries using carbon? And this is a point worth quibbling over, since they produce hardly any of the carbon? If so, you're wrong, climate change would indeed be a minor issue if this had happened.