I can guarantee you that, with all the specialization and global reliance present in the world right now, a 30-60% loss in human population was cause societal collapse. The loss of supply routes would lead to implosions in various sectors of human civilization which would probably lead to further death. It is not entirely impossible that the human race would either go extinct or regress to a more primitive state.
It's much worse because fewer people (especially in more developed nations)0 know anything about tool use, farming or general survival practices.
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