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I really doubt the death rate has been calculated and I doubt it could be done to any sort of accuracy. One major problem would be to disentangle climate change fatalities from other factors such as desertification, soil degradation etc due to over-use. Then there is the problems of unequal distribution of food, medical care etc solely due to our economic 'system'.
Nuclear power is no panacea. While it is true that reactors don't produce CO2 during operation they produce a huge amount during construction because of the amount of cement they require - far more than a conventional power station. The production of cement from limestone is CaCO3 + heat -> CaO + CO2. So for every 56g of cement there is 44g of CO2 plus whatever is generated by the heating process. I haven't looked at the figures but someone I trust told me that, compared to a coal-fired power station, it takes a nuclear plant 15 years to pay off the CO2 'debt' from construction. That is a very substantial fraction of the operational life of the plant. Then there is a whole lot of dangerous waste that will need guarding for millenia. I think we have to look at energy efficiency and green power of various types.
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