> For example, 8 degrees of warming would be much worse than 4 degrees of warming
You should review where you got those figures and whether they are representative enough of current scientific consensus regarding the most likely scenarios.
As fas as I know and assuming that current pledges are fulfilled, most plausible estimations tend to be around 2 or at most 3 degrees of warming above pre-industrial levels (we are already well over 1°C).
While it is clear that this increase in temperatures will have severe consequences, I fail to see how it would lead anywhere near the civilization collapse that you seem so confident in predicting.
That's a pretty big assumption, to assume that current pledges will be fulfilled. Last I heard, it was just, like, Gambia that was on track to meet Paris Agreement pledges. https://www.cnn.com/2021/09/15/world/climate-pledges-insuffi... None of the G20 countries are on track.
The point of the Paris Agreement pledges is to prevent catastrophic global heating, so it would be great, although in my opinion inadequate, if the world community met them. Sadly, we're not heading in that direction right now.
You should review where you got those figures and whether they are representative enough of current scientific consensus regarding the most likely scenarios.
As fas as I know and assuming that current pledges are fulfilled, most plausible estimations tend to be around 2 or at most 3 degrees of warming above pre-industrial levels (we are already well over 1°C).
While it is clear that this increase in temperatures will have severe consequences, I fail to see how it would lead anywhere near the civilization collapse that you seem so confident in predicting.
See for example: https://www.nature.com/articles/s41586-022-04553-z.epdf
("Realization of Paris Agreement pledges may limit warming just below 2 °C", Nature)