They are different because when we pack the spaceship with fuel, we control with reasonable certainty whether they make a safe landing or not. As for our millions-of-years descendants, it's very hard to make any statement about us effecting them with >51% confidence (except, "we shouldn't exterminate ourselves").
A lot of what looks like time discounting is really uncertainty discounting.
A lot of what looks like time discounting is really uncertainty discounting.
Cowen is explicitly discussing time discounting. As he writes, "Should we—because of positive discounting—not give them enough fuel to make a safe landing?" (emphasis added) There may of course be other reasons for treating these people differently, including uncertainty about the long-term future, but Cowen is not focusing on these reasons here.
Another month has passed and here is a new rationality quotes thread. The usual rules are: