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The spatio-temporal limitations of human existence can be considered a threat to the significance of our lifes. Ronald Dworkin proposes two competing models or metrics for the evaluation of our activities: the impact model and the challenge model. Using the first model involves assessing the contribution that an individual life brings to the objective value in the world, according to agent neutral and global standards. The second model is based on the assertion that our personal events, achievements and experiences can have ethical value even when they have no impact beyond the particularity of the life in which they appear. The assessment in this case is based on agent relative and localized standards. The purpose of the article is an analysis of how the two models solve the problem of the long term significance of our individual lives. If the ethical value of an individual life is the sum of its consequences, then, to the extent that they have no substantial effects on the world as a whole, human lives are threatened by insignificance. In the second case, it depends only on individual performance as a response to those challenges that we consider important for our own existence. This second view provides a more plausible explanation for how our achievements could remain meaningful even on a cosmic scale.. © 2017 Published by Future Academy www.FutureAcademy.org.UK