Alright, so we pump energy into a chaotic system and obviously the extremes will get more exteme. Stronger hurricanse, colder hurricanse and snap freezes, deeper floods, wet bulb events further north than you think possible, whatever. This is the known unknown.
I am existentially afraid of the unknown unknowns. At what point do the phytoplankton I'm currently breathing the poop of have a mass extinction event? All of human civilization is about to drown on dry land and I spend 5 days a week maintaining software that charges people for turning on their lights.
I crave death I crave oblivion death to america death to capitalism death to me.
As others have said, the plankton thing isn't going to happen but it also doesn't have to in order for climate change to cause industrialized society to collapse. You're right to be worried about climate change, and the best you can do is actual activism to maybe do something to mitigate it. The second best thing you can do is make yourself numb and not think about it.