Answered : Climate change and Bio terrorism. Someone engineering a virus that kills, planned.
As for this pandemic he says his favorite writer is Vaclav Smil. And that writer previously listed real risks to mankind by priority. And he listed pandemic the first one by far. And second one was nuclear war.
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https://www.youtube.com/watch?v=Grv1RJkdyqI
https://www.youtube.com/watch?v=Grv1RJkdyqI