[dragoncrab]

Heat is less likely to kill you directly if you aren't forced to do physical work without any protection. However, tens of thousands of square kilometers of agricultural land is turned to desert in Central Europe with every single degree the yearly average temperature rises. Droughts are decimating crops made for prices skyrocket even before the war in Ukraine. That has some harder to attribute but none of the less serious killer potential.

On your other thoughts: I live in a well insulated home (30 cm brick wall with 18 cm graphite insulation). With a 30 celsius difference in internal and external temperature and no heating, my living room drops about 1,5 - 2 Celsius a day. Starting from 21, that gives a week before situation starts to become serrious during a complete blackout.

[wizwit999]

I mean it works both ways, e.g. thousands of sq km of Russia and Canada become would likely become fertile agricultural land.

[triceratops]

Not really. Russian and Canadian land will become warmer but does it have good topsoil?

[nikanj]

Heat has a well-defined kills-you-automatically limit of ~35 celsius wet bulb temperature. There isn’t a similar limit for cold.

[NorwegianDude]

That temperature drop sounds very unlikely. If you live in a well insulated home then you must have ventilation too, and that alone should replace the air inside multiple times each day.

[dragoncrab]

I have measured this while being away for a week during winter.

While there is ventilation in the building, it's off while noone is at home.

Although the scenario in question was for a complete blackout where the ventillation would be off as anyway, your are right that people inside would need to open windows every now and then which would increase heat loss.

[mderazon]

Interesting, can you explain more about this type of insulation?

[antisthenes]

It's just polystyrene. The graphite is a marketing term that doesn't have much to do with the material properties.