What @ClimateBen says is best available science, not fringe opinion. Sources below. And it doesn't happen suddenly AT the end of the 40s. It has already begun and worsens over time. It's a train wreck in slow motion with suffering and deaths and global destabilisation and fascism

I'll add 4 sources here. The most important one is the video abstract of a paper by @EdwardByers , part 2/2. Because only this source shows how important global solidarity today is in alleviating poverty so as to lower the vulnerability in climate

Or check out IPCC SR15 table 3.4. The figures in millions of people exposed or exposed and vulnerable are for the year 2050 on the respective warming pathways toward 2100. So in all likelihood we're already in for the 2˚ columns.
We can lower the impact only in global solidarity

condensed the figures into 3 stills for their primer on climate impacts, "The hard truths of climate change — by the numbers" https://t.co/qTqBVheHIl
But it doesn't show how global solidarity and alleviating poverty from today onwards can significantly lower vulnerability

Here's an interactive map to explore climate risks and hotspots: https://t.co/mbNk6m21lW
IMO, this info should be on newspapers' frontpage everyday as a constant warning where we're headed if we continue to hope for incremental efficiency improvements to our current system setup