Regenesis

Hereditary aristocrats order the building of palaces; plan colonies and wars; plot, scheme, and murder each other; all while watching for signs of rebellion among the slaves who make their life of luxury and backstabbing possible. ( But unlike in the Roman Empire, on the planet Cyteen the slaves cannot even dream of freedom. )

By Light Alone

Malthusianism is a topic that many science fiction writers have tackled, but the genre can not be said to have come out looking particularly good. ( The trouble is that the conventions of the genre require that a story must not raise a problem without solving it within the compass of the narrative, by some kind of heroic action. )