> There won't be an extinction event.
This also ignores the fact that we are currently in the 6th largest extinction event in the history of life on this planet [1]. Elizabeth Kolbert's The Sixth Extinction is a great book on this (and the history of our understanding of species extinction as well).
So aside for being naive about the science, your comment reads a bit like claiming you don't think it will rain today while in the midst of being soaked in a massive rain storm.
1. significantly increased amount of 'life' on earth (as in: total kg of biomass, number of living specimens, total area with some amount of green stuff on it) due to warmer climate.
2. significantly reduced number of extant species on earth due to (geologically) fast changes in climate.
Edit: formating.
Reducing biodiversity doesn't equate to an extension-level event though. It also doesn't mean all species who didn't thrive would be lost - many would be affected but not existentially so.
I'm reminded of George Carlin's joke about the planet being fine long-term, we're the ones who will be screwed.
From the Encyclopaedia Britannica [0]: __These conspicuous declines in diversity are referred to as mass extinctions__
> It also doesn't mean all species who didn't thrive would be lost - many would be affected but not existentially so.
But this is not a fact, it is a conjecture. On the other hand, we do have declining numbers of a big number of species. Unless the tendency reverts, constant long-term declining numbers will be an existential threat.
> I'm reminded of George Carlin's joke about the planet being fine long-term, we're the ones who will be screwed.
That's true, for sure. But asides from "the planet" and "we", there are also all the others.
Eocenic period had high CO2 levels, but it didn't lead to ocean anoxidation. In fact, at the end of the period, the eocene-oligocene exctinction event happened in connection with reduced CO2 and global cooling of the climate. [0]
[0] https://en.wikipedia.org/wiki/Eocene–Oligocene_extinction_ev...
There are many natural ecosystems which could and would be severely disrupted as the food chains there break up.
However, the food chain for homo sapiens largely relies on artificial monocultures that can be moved around and replaced on a large scale if the local conditions change. Natural environment can't switch to a "warmer climate biome" overnight, but a farmer can and will plant an entirely different crop in the next season if that suits the place better now, with only some expenses in retooling tractor attachments. And while there are many food industries which are relatively brittle, these are relatively niche 'luxury' foods which often are economically very valuable, but not the staple foods which actually feed the population. Like, if California had to abandon growing almonds due to water issues and instead grow something less demanding (and less profitable), that would destroy a huge industry but wouldn't cause food insecurity.
As just one example, ocean acidification could kill a lot of the algae. Pretty much everything is upstream of algae. It would be catastrophic, even for us.