They also mean that the next world war is going to be devastating. I think it's too early to tell if we've just replaced a medium risk of a medium scale traged

They also mean that the next world war is going to be devastating. I think it's too early to tell if we've just replaced a medium risk of a medium scale tragedy with a low risk of an unimaginably bad tragedy. There were two world wars last century, and we're not even a quarter of the way through this one yet.