[T]he topic of overpopulation has more than one trap, and I think By Light Alone doesn’t steer clear of them all.
It seems to me this novel shares an idea with Walter Jon Williams "The Green Leopard Plague". Hmmm. And also the Robinsons' Stardance books, which were using an idea from Varley (the latter two moved the idea to SPACE! or given the arrow of time, AR and WJW moved it to Earth).
Also posted at Dreamwidth, where there are comment(s); comment here or there.