Climate sensitivity, though, is widely debated. Even some of the most pessimistic projections put the global temperature increase over the next 100 years at around 2-3 degrees C. That's not an existential threat - the earth is not going to become an uninhabitable fireball.
A 2-3 degree increase over the next 100 years while devastating would be fantastic and I'd take it in a heartbeat even though the havoc and death caused by 3 degrees of warming over a 1750 baseline would kill most land animals and turn the oceans acidic but there is no way it stops there and there is no way it takes that long. People have problems understanding what feedback loops are and the power of the exponential function.
As we warm it in turns feeds more warming gasses into the atmosphere in a loop. Around the globe there are hundreds of them churning and turning then unleashing more then in turn, more.
Positive feedback loops accelerate. It's why we're far outpacing even the most dire predictions from the IPCC. 2100 is a joke. 2050 is a pipe dream. We're moving into an entirely new climate with entirely new rules and it is well underway now. By 2030 it will be unrecognizable. Why don't you hear anything about the ongoing 6th mass extinction event?
Rate of change. How fast can the plants and animals adapt to the change in their environment as when rate of change exceeds the ability to adapt then the result is extinction.
Look around you as far as you can see. Nothing survives a rapid 3 degree warming. How about an 18 degree global warming by 2026 caused by methane pulsing out of control in the ESAS? Remember the Russian expedition in 2019? Shakhova returned in tears. As a scientist and methane expert it was her worst imaginable fear as she understands what those readings mean. More warm water is flowing up the gulf stream into the Arctic and the ESAS. The destabilized cold air in turn moves out of the arctic down over the continental US and you get those "arctic blasts" that are suddenly a thing. And a trillion tonnes of methane in the ESAS is further destabilized by the warming water at depth.
The last thing you will see is the sky burn. The planet is going to be baked. As nuclear power plants melt down we will lose our atmosphere and all our water. Absent a protective atmosphere, open space will scour the planet's surface clean so that no sign of anything is left. A dry lifeless rock much like Mars is all that will remain. Maybe a few billionaires will watch it all from space.