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Speaking of John Barnes (as it were...)
Another book of his, Kaleidoscope Century, is another near-future example -- perfect for a "dark" Earth that folks might like to avoid. It's actually written from the point of view of an agent of the "Bad Guys," who do things like assassinate biotech scientists just as they create vaccines for plagues. He's not even an anti-hero. He's just plain bad. And as Voltaire53 wrote above, it's shockingly graphic, for violence, sex, etc.
Made for a tremendously compelling read, I must confess. The tech ideas, and society stuff, etc. is really interesting, and every now and then I think about picking it up again to re-read.
But then I remember all the yucky parts...
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I suppose the following ought to go to the CT forums, or the general QLI list of books, but the Canadian author "emerita" Phyllis Gotlieb has written a rather large number of novels that most people don't seem to have encountered. They all have a very strong CT flavor. Additionally, she's really very good at making the aliens very alien. In terms of 2300/2320AD, several of her short stories and some of the longer ones involve colony worlds, with various "situations:" machinery and equipment problems. pesky native life, lethal native life, corruption, etc.
Some series and titles...
Dahlgren // can you say Syddites?
1. O Master Caliban! (1976)
2. Heart of Red Iron (1989)
Starcats
1. A Judgment of Dragons (1980)
2. Emperor, Swords, Pentacles (1982)
3. The Kingdom of the Cats (1985)
Flesh and Gold
1. Flesh and Gold (1998)
2. Violent Stars (1999)
3. Mindworlds (2001)
The Starcats series is essentially about some members of the IISS...well, okay, GalFed is not exactly the Imperium.
Collections
Son of the Morning: And Other Stories (1983)
Blue Apes (1995)
The Son of the Morning work earned her a Nebula nomination
I can't recommend Gotlieb enough.