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
I think this is a great question. The lack of clear, demonstrable progress in reducing existential risks, and the difficulty of making and demonstrating any progress, makes me very skeptical of longtermism in practice.
I think shifting focus from tractable, measurable issues like global health and development to issues that - while critical - are impossible to reliably affect, might be really bad.
As I say I don’t think one can “measure” the probability of existential risk. I think one can estimate it through considered judgment of relevant arguments but I am not inclined to do so and I don’t think anyone else should be so inclined either. Any such probability would be somewhat arbitrary and open to reasonable disagreement. What I am willing to do is say things like “existential risk is non-negligible” and ... (read more)