@arstechnica The number I’ve used for years to represent the “worse case” scenario is six degrees, as in “by the end of this century, average global temperatures will have risen by six degrees since the beginning of the Industrial Revolution”. I call it the worst case because it’s where we’d be if we did nothing about climate change.
I did not take into account that people would actively make it worse. It is now a distinct possibility that all civilisation would collapse this century.