They represented a civilization that had, during the Fourth Millennium, executed a plan to undo the damage caused by the Agent by identifying, cataloging, reaching, corralling, and revectoring millions of rocks in orbit around Earth, while also reaching as far as the Kuiper Belt to acquire chunks of frozen water and methane and ammonia and bring them home and smash them into the ruined planet. Essentially all of this work had been accomplished by robots. So much metal had gone into their construction that millions of humans now lived in space habitats whose steel hulls consisted entirely of melted down and reforged robot carcasses. It would have been easy for them to blanket the surface of New Earth with robots and, without ever sending down a single human being, perform a kind of survey: one that was heavy on data and light on judgment. In that version of the world, Kath Two and the others would have spent their lives in habitats, working at varps and mining data. All sorts of interesting philosophical arguments could have been framed as to whether that approach was better or worse than what they were in fact doing. But philosophy didn’t really enter into it. The decision to do it this way was driven partly by politics and partly by social mores.