As Indur Goklany points out, deaths from extreme cold are much more common than deaths from extreme heat. In fact, extreme cold causes more deaths than all other weather-related causes combined.
It's much easier for a homeless person to escape the heat (with shade and water) than the cold.
Considering also the well-known health problems that come up every winter (the "cold and flu season"), it would be better for all of us if this season were shortened.
So I think we should be dumping as much CO2 into the air as we can.
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