The majority of life ? lmao, nope
The current world average temperature is around 14-15°C.
During the Cambrian explosion, where the amount of different lifeforms on earth increased dramatically, it was 20-25°C.
And we're not even going to die off anyway. Some currently populated areas are just going to get depopulated real fast, that's all. And we're going to build new cities in different places that were too cold for us before, or maybe underground. Some lifeforms will die off because they were too fragile, others will appear and thrive. Same as it's always happened.
Bien sûr qu'il y a des gens qui ont le temps, on appelle ça des parlementaires.