I came across an recent article on The Economist. Humanity from time immemorial has face existential risks either natural or man-made. Black Swan events have dominated major progress in societies. I believe the paranoia associated with such events and ideas is overblown. Instead, these are opportunities to learn a lesson around designing robust socieities of the future and minimizing life's entropy. Protecting elitist institutions, racist ideologies and power are truly inconsequential in the larger scheme of things. This is especially a reminder to the ones still stuck in the means of the medieval ages.
I'm keeping an incomplete list of existential risks to humanity here and hoping to find opportunities to reduce entropy introduced by these events.
Giant volcanic eruptions
Gamma rays from a nearby hypernova
Some risks are still being evaluated largely from an anthropolgical impact perspective. In fact, I'd say these are more dystopian sci-fi risks and than real world ones, so far.