Pneumonia kills over 100 million people each year (!?! actually more like 4 million per year).

I doubt global warming will ever kill people at anywhere near that rate.

In fact, since - as Freeman Dyson says - more people die from cold than from heat, global warming will probably reduce the overall death rate:

More people die from cold in winter than die from heat in summer.

According to "this report about the study "Causes for the recent changes in cold- and heat-related mortality in England and Wales":

Warming is highly beneficial to human health, even without any overt adaptation to it. And when adaptations are made, warming is incredibly beneficial in terms of lengthening human life span.

The study says that changes in heat-related mortality in the UK are smaller for warming than for cooling over the past 4 decades by two orders of magnitude.

However, one study produced different findings in the USA - here.