[Question] What are the best examples of object-level work that was done by (or at least inspired by) the longtermist EA community that concretely and legibly reduced existential risk?

A motivating scenario could be: imagine you are trying to provide examples to help convince a skeptical friend that it is in fact possible to positively change the long-run future by actively seeking and pursuing opportunities to reduce existential risk.

Examples of things that are kind of close but miss the mark

  • There are probably decent historical examples where people reduced existential risk but where thoes people didn’t really have longtermist-EA-type motivations (maybe more “generally wanting to do good” plus “in the right place at the right time”)

  • There are probably meta-level things that longtermist EA community members can take credit for (e.g. “get lots of people to think seriously about reducing x risk”), but these aren’t very object-level or concrete