[T]he things we have created will eventually vanish once human beings are no longer around to preserve them. However, achievements are events, not things, and events that have occurred cannot be undone or reversed. Therefore, it will continue to be true that our achievements occurred even if humanity ends. One disadvantage of having an unalterable past is that we cannot undo a wrongdoing that occurred. However, an unalterable past is also an advantage in that our achievements can never be undone, which may give some consolation to those who desire quasi-immortality.
Brooke Alan Trisel, ‘Human Extinction and the Value of Our Efforts’, The Philosophical Forum, vol. 35, no. 3 (Fall, 2004), p. 390