It seems like all the global warming theories seem to omit on variable, the sun. Solar output is not constant and has far more impact on climate than molecular level changes in CO2 levels. We are now entering a well documented Maunder Minimum in solar activity that historically has produced near Ice Age conditions. We are facing significant global cooling and no treaty, carbon sequestering or reduction in fossil fuel use can have any impact to slow or stop the cooling anymore than King Knute could stop the tides.
A recent demographic study concluded that even moderately cold weather produced a human mortality rate 20 times higher than hot weather. And that is just a short term “cold spell”.
A solar minimum approaching Maunder Minimum levels for 70 years could right now result in tremendous loss of life: first from the cold itself, second, from famine, and third from deficiency and pulmonary diseases. Ideal conditions for transmitting disease by sneezing and coughing are 40F with low humidity.