IMHO the Renaissance is a textbook example of adaptive radiation following the 14th Century Extinction event, transposed from the context of biological evolution to cultural evolution.

Oye, vatos, dees English sink todos mi ships, chinga sus madres, so escuche: el fleet es ahora refloated, OK? — The War Nerd

That's why aI took a quite strogn definition of die-off at one fifth.. One fifth events are particularly rare.. even in human history... I wanted to indicate that human populations ..e ven in rare circumstances do not ahve one-fifth ratio fo deaths.. unless they are unleashed by other group of people killing them directly...

And I think that the probability of soem sudden global war among large groups of people is not taht high... but maybe I am being too optimistic.. the thing is that a global war could get ut of control and affect those in command of it.. making it much more less palatable.

ANd massive die off due to economic circumstance are very rare (although it can help to increase the risk of some population.. but frankly most of the people in the world already do).. and regarding soem kind of ecologic cataclism.. well it will be pattern based and local.. so there can be massive disruption ... refugwees... but not reaching the one-fifth threshold.... that was my point..

Of course ... the probability of major climate catastrophe includes an increase in the death rate... but not a massive die-off...... but I do not call 100 million people dying suddenly due to a rise water leves a "massive die off"... because it does not reach the 1 billion people threhold.

A pleasure

I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude