I don't think 2c is achievable. We're gonna need everything to stop 4c.
As for the rest I agree. We're fucked. But there's "geologically scale ruined the biosphere but still somewhat functioning as a civ" fucked and "unlivable planet, no seasons, no crops, weather shuts down trade by making ports unviable, everyone dies" fucked
4C is probably "humans still alive as a species but in incredibly reduced numbers and no functioning large scale modern civilization". At 4C there's not a lot of food that can be produced; heat actually becomes lethal for days at a time in large areas of the world; extreme weather events have become the norm.
I don't think 2c is achievable. We're gonna need everything to stop 4c.
As for the rest I agree. We're fucked. But there's "geologically scale ruined the biosphere but still somewhat functioning as a civ" fucked and "unlivable planet, no seasons, no crops, weather shuts down trade by making ports unviable, everyone dies" fucked
4C is probably "humans still alive as a species but in incredibly reduced numbers and no functioning large scale modern civilization". At 4C there's not a lot of food that can be produced; heat actually becomes lethal for days at a time in large areas of the world; extreme weather events have become the norm.