Peter Singer (yes, that Peter Singer) has a piece at the New York Times philosophy blog where he tries to grapple with the question of whether it is moral to reproduce. He spends most of the piece laying out arguments as to why we should choose not to have children due to the suffering that live involves, then at the end states (without much explanation) that he doesn't actually support the idea of voluntary extinction through refusal to reproduce because a would without people in it would not be as good -- though he never explains how he reaches this conclusion given what came before.
On the flip side, Jeff Mirus of CatholicCulture.org writes a piece on how Catholics are ready to change the culture because they actually have the theological and philosophical reason to believe that having children is a good thing.
Who shall inherit the earth?
Isaac of Nineveh for Lent XXXVIII
42 minutes ago