Comment by imtringued

Nordhaus' riksbank price winning work justifies global temperature rise to +4°C as optimal. At that point the vast majority of humanity is going to die out with just some pockets surviving.

The reason is quite basic. Global temperature includes the oceans which make up 70% of earth's surface and have a higher storage capacity for heat. So a 4°C global temperature rise might be closer to an 8°C increase to your current local average temperatures and that's the normal days. If you have heat waves those might be +15°C or more.

At those temperatures, Americans and Europeans might need air conditioned buildings just to survive. Other places will require people to wear portable air conditioners.

Obviously you'll also need to move all agriculture indoors.