First, that line is drawn wrong because by 2020 warming was + 0.9 C, not +1.25 C as shown. Second, absolute average temperatures like 15.3 and 13.8 are less certain than the difference, which is why the difference is used instead (If you subtract 13.8 from 15.3 you'll get the wrong value because they were measured using different techniques).

But most of all, I take issue with the idea that +1.5C or +2.0C will cause climate chaos only seen in movies. It will cause many extinctions (because there are very many species) and some people might have to move, but more likely some cities may need to build some storm walls. My bet is people won't even move in significant numbers.

Global warming does not cause extreme weather events, it only increases their frequency or intensity (or both) by small amounts because the weather system has more energy in it... so when you see devastatingly high temperatures or massive wildfires, these are only slightly worse than they would have been if climate change wasn't happening.

Far more people die of "too cold" than of "too hot"... at about a rate of 10 to 1. Global warming will save lives.

Earth is coming out of an ice age where temperature and CO2 levels have been extremely low (looking back at the last 100 million years or so). However, humans evolved during the last few million, so where we are going is unprecedented for humans, but not for primates. Humans originally specialized as persistence hunters - heat was in our favor.

I think we should cautiously and smartly figure out how to stop putting CO2 into the atmosphere. We are emitting it far too rapidly to be sustainable. We probably need to continue to burn fossil fuels in order to invent the solutions. Many solutions are already online as rich countries are emitting less and less over time. But I don't know how to tell poor African and Indian kids that they aren't allowed to get rich.

I think it is neigh impossible to stop climate change and you'd be better served figuring out how to adapt. For example: this might be a good time to buy property in Russia.

And I'm not here to argue. This is just a dump of my brain for your edification. Take it or leave it.