[Question] What’s the GiveDirectly of longtermism & existential risk?

GiveDirectly has a huge space for additional funding and spends the money effectively. It’s processes are simple and most poeple can see it’s helping.

What is the longtermist equivalent of this?

What is the organisation you give to to improve the longterm future, with these critera, which can sit as the organisation of last resort to donate to?

This question was brought to you by me stealing Ben Todd’s tweets and turning them into questions. https://​​twitter.com/​​ben_j_todd/​​status/​​1459196519924604928

Please write one suggestion per answer.