Longtermism and Existential Risk

Longtermism is the view that positively influencing the long-term future is a key moral priority of our time — because if humanity survives, the number of future people dwarfs everyone alive today. Existential risk (x-risk) is anything that could permanently end that future.

#The core claim

present humans:  ~8 billion
possible future humans:  trillions, if we survive
→ even a tiny reduction in extinction risk can outweigh enormous present-day good

So reducing existential risk — pandemics, nuclear war, and especially unaligned AI — becomes one of the most important things anyone can do.

#Why AI sits at the center

Most x-risk frameworks rank misaligned superintelligence among the top threats: it's a potential black ball, it could be irreversible (The Control Problem), and it could arrive fast (The Technological Singularity).

#The critiques

Longtermism is powerful but contested: it can justify neglecting present suffering, leans on speculative numbers (Pascal's Mugging), and asks who gets to speak for trillions of unborn people (The Value Loading Problem).

Related: The Vulnerable World Hypothesis · The Control Problem · The Doomsday Argument