Lawrence Krauss sees humanity's insignificance and eventual disappearance as reason to cherish the time we have. Norm Geras pushes back:
[W]e may celebrate an individual life when it has ended, as having been rich in experience, loving relationships, achievement and so on; but when it's over, that is a loss some people will grieve about and more people still will feel as being such. How much more true must this be if death is the future, even a remote future, for humankind? What a gigantic loss! We might accept – those of us who do – that it is both inevitable and irredeemable. But to treat the whole business, smilingly, as only spiritually uplifting seems to miss a certain tragic dimension in things.
The Dish 