The notion that humanity would go extinct from any of this is absolutely unrealistic.

What we are talking about is at worst massive economic damage and loss of life, similar to a very serious war.

Which is horrible, but really not the threat it is made out to be.

Moreover, since these changes happen relatively slowly (compared to bombs and such) much of the loss of life can be mitigated.

So we are talking economic damage and loss of property and infrastructure. Primarily.

Let’s be honest that the most likely course through all this is to adapt to the changing planet. I think that would be so much more refreshing than all the hand wringing.