[[caption-width-right:183:"Two creatures - a single ancestor."]]

''Man After Man: An Anthropology of the Future'' (1990) is the third [[SpeculativeDocumentary speculative evolution]] book written by Scottish geologist Creator/DougalDixon, and the most controversial installment of the trio. Allegedly a science-fiction account of future human evolution, the premise and its accompanying illustrations can come off as disturbing. Unlike Dixon's previous two outings, this book deliberately ignores the laws of evolution, biology, and genetics when the plot calls for it; these contrivances are not helped by the unsettling pictures and imagery that accompany the posthumans of the distant future. Also unlike Dixon's previous two books, this one has a narrative component and focuses on individuals across time rather than entire species, even giving them individual names.

The main plot of the book starts 200 years from now, which for the book's scale is almost the present day. Humanity begins to play around with its own Genetics, like a kid with {{Lego}} blocks on [[LegoGenetics a large scale]], creating new Humanoid creatures known as aquamorphs and aquatics (or basically FishPeople), and vacuumorph beings that have been engineered for life in the vacuum of space. Their skin and eyes carry shields of skin to keep its body stable even without pressure as [[LivingShip living space probes]].

Unfortunately, a century later, environmental deterioration finally kills off most of the planet's fauna. Humanity is (inexplicably) one of the only species left standing and so a faction of the survivors (a [[{{Cyborg}} cybernetically enhanced]] offshoot known as the Hitek) begin to create new Biotech Human species for the next 500 years en masse to fill in some of critical ecosystemic niches left by the general absence of the Earth's now countless extinct animal species. Meanwhile some of the remnants of unaltered humans decide to leave the wrecked earth and return when it gets well...better, while others, without the benefit of technology, return to barbarism and later start to build a form of civilization again.

Unfortunately [[FromBadToWorse that doesn't happen]] when [[ReverseThePolarity the Earth's magnetic field flips]]. The Hitek (and also the remaining normal humans) went extinct themselves, allowing the altered humans to naturally evolve for a few million years (which is the main point of the book). Ironically, the descendants of humanity that went to the stars and now return have themselves been altered - and possibly evolved - so much they no longer recognize their ancestral planet, let alone the animals on its surface, and exploit both to the point of eradication.

Near the end of the book, most of the Earth's inhabitants either leave or die out, leaving only a species of deep-sea aquatics to eke out hand-to-mouth lives on the ocean floor, although someday (according to the book) they would eventually leave the water and become the new dominant species on the planet.

The majority of tropes below might lead you to think that this is some sort of horror novel or film. However, this is far from the case. In fact, it's only a flight of fancy created as a fictional textbook. [[WhatDoYouMeanItsNotForKids Ya Know, for Kids!]]

[[http://www.sivatherium.narod.ru/library/Dixon_3/01_en.htm You can read it here.]] [[SchmuckBait Don't say we didn't warn you]].

!!''Man After Man'' provides examples of the following tropes:

* AfterTheEnd: The entire premise of the book.
* AndIMustScream: Mainly the Food Creature (see Let's Meet the Meat, below), a grotesque mountain of flesh and fat with distorted, but still human-like features, and many of the book's altered humans that have become worker drones, maintenance units or transportation. While some do indeed have actual faces and eyes, they don't appear to be able to to react to the general external world in any way.
** This also includes the Vacuumorphs, exoskeletal Humans that are used as [[OrganicTechnology living space scouting probes]] that have all of their vulnerable parts sealed up so they can survive the natural elements of outer space without the need of a ship. [[OffscreenInertia And since its never mentioned]] no one from Earth retrieves them. In other words Vacuumorphs are [[BlessedWithSuck cursed]] with staying in space without any way of directly seeing or communicating with the outside universe (except through their surgically attached planetary surveying equipment) and are ([[FridgeHorror presumably]]) forced to consume nothing but their own recycled natural waste until finally accidentally falling towards and burning up in a random planets atmosphere. They cannot even travel through space- it is stated that are high-orbit space ship engineers only. Their bodies cannot operate or even survive in gravity at all - and that includes the artificial gravity of an accelerating space ship. They're stuck in near-Earth space.
** The book also states that the vacuumorphs do indeed still need to breathe oxygen, the genetic engineers were unable to build a species that didn't need to breathe. So they have 3 large lungs with massive storage capacity, and a reduced metabolism so that they can survive on their stored oxygen for some considerable length of time before having to refill their lungs. However when they were left behind during the mass planetary evacuation, they would eventually have died in a few weeks with no ways to get any more breathable oxygen.
* ApocalypseHow: A Class 1 occurs due to global warming in 2200, destroying most of the coastal cities. A Class 3 destroys Homo sapiens around 3000 when the magnetic poles reverse, [[SerialEscalation and finally]] A Class 5 occurs at the end of the book [[spoiler: instigated by the starfaring descendants of humanity]].
* ArcWords: "Someday."
* AWorldHalfFull: See ChekhovsGunman below.
* BeePeople: The Plains-Dwellers slowly develop increasingly organized social structures as the climate changes; by the end of the book their descendants are completely eusocial and united under a few queens.
* BladeBelowTheShoulder: The plains-adapted hominid has a horn-like blade on the side of its hand for cutting grass, and this evolves into a weapon as its species becomes communal and caste-based.
* BodyHorror: The Tics and the Engineered Food Creatures are the two most notable culprits.
* CrapsackWorld: By the book's near end this entire story pretty much embodies this trope. Humanity does not exist anymore and most of its descendants have been wiped out by its other descendants, who are no longer human by any definition of the word ''and'' leave Earth for good, with its resources depleted and its atmosphere unbreathable to anything human. The relatively near future of the 22nd-23rd Century is also portrayed as one, with modern civilization on the verge of collapse and some lucky souls pulling an [[SidMeiersAlphaCentauri Alpha Centauri]]. [[spoiler:Eventually, [[FromBadToWorse they come back]] 5 million years later...]]
* DarkerAndEdgier : Compared to Dixon's previous speculative biology books, ''Literature/AfterManAZoologyOfTheFuture'' and ''The New Dinosaurs''. The far darker and horror-like tone of the book caused some pretty big backlash from those who were expecting something similar to the previous two.
* EyelessFace: The water-sensing species carried and cared for by desert Hivers.
* [[ChekhovsGunman Chekov's Species:]] [[spoiler: Piscanthropus profundis.]] About one sentence is given to a population of aquatics [[spoiler:that colonizes the deep ocean]] and are never heard from again. [[spoiler: 5 million years later, we learn that their descendents have still survived and [[AWorldHalfFull may one day re-colonise the surface of the ravaged Earth.]]]]
** Jimez Smoot also qualifies. Early on in the book, he is one of the humans to [[spoiler: leave Earth to find another planet suitable for containing life. 5 million years later, his descendants return to Earth and kill all life anywhere except in volcanic vents deep within the ocean.]]
* FromBadToWorse: By or near the book's end, the remains of Humans left on Earth bear either little to no resemblance to what they were or even what their evolutionary ancestors were. Aliens have taken over the planet and enslaved every living thing on it. Original Humans - if there even are any left at all - are now doomed to nearly eternally roam the universe [[Franchise/BattlestarGalactica in search of a new home]]. And the Hitek probably acted more machine than man. It doesn't help matters that those aliens also happen to be [[spoiler:descendants of those Original Humans to fled to space]].
* GaiasLament: Most modern animals are extinct. Fortunately, things improve when the Hiteks engineer new human species to fill these vacant ecological niches.
* GenreShift: After civilized humanity and its offshoots go extinct, the book's tone shifts into that of a nature documentary. Justified in part due to many of the hominids barely having any substantial resemblance to Original Human. [[spoiler:And then it shifts ''again'' following the return of mankind's spacefaring descendants...]]
* TheGhost: A subterranean species of hominid is listed on the evolutionary tree at the start of the book. One of its ancestors is shown exploring a cave, and a later incident is mentioned in which a surface-hominid vanishes after sleeping near a cave many thousands of years later, but the UndergroundMonkey variant is never shown or described.
* HumansAreBastards: Due to the massive genetic tinkering/fiddling/manipulation/outright butchering that humanity performs on its own collective self that starts this whole bizarre mess to begin with. Although both regular humans and Hitek try to justify it as [[UtopiaJustifiesTheMeans either Utopia or more so base survival justifies the means]].
* HumansArePsychicInTheFuture: Well, technically they're not humans anymore, but the "water sense" and race-memories of some post-human species arguably made this one a JumpTheShark for Dixon.
* ImAHumanitarian: Sort of played straight. Some of the new post-human species are depicted eating other members of other human species.
* LanguageDrift: Implied to have occurred in the initial centuries into the future, with certain terms (Hitek, Andlas) being either corruptions or evolutions of English (High Tech, Handlers respectively)
* LetsMeetTheMeat: Many, many of the altered humans that were later used as new sources of meat. Predominately with a being known only in the book as a ''"Engineered Food Creature"'' that was another engineered human that grew as "mounds of fat and flesh, fed by chemical nutrients via a mass of pipes and tubes inserted directly into the fleshy blob. After it grows large enough, sections of its meat, tissue and body fat are butchered off..."''While It's Still '''Alive''''', Bon Appetít!.
* LuddWasRight: The Original Humans left on Earth are described as gradually becoming this trope, reverting to a simple hunting, farming and fishing by the time they go extinct. Although there are "civilized" enclaves called Andlas that persist for a time.
* OurVampiresAreDifferent: One species of hominid evolves into something convergent with vampire bats, clinging to and feeding off a much larger, bloated hominid species.
* PlanetLooters: After humanity's descendants return in an unrecognizably altered form, they exploit the planet and its remaining non-sapient inhabitants to extinction and then simply leave - presumably to do it again to another planet.
* RagnarokProofing: Explored to a degree, especially early on when future humans and their engineered descendants stumble on the decaying ruins of civilization. Eventually however, all traces of it are lost forever.
* SpacePeople: The vacuumorphs.
* StepfordSmiler: The Hiteks, as a result of being a modern, overmedicated Prozac nation taken to its logical extreme. Their cybernetic "Cradles" are equipped with drug feeds that are used not just to treat depression or other mental illnesses, but ''any negative emotion whatsoever'', both trivial and meaningful. We see in two separate vignettes one Hitek who uses drugs to silence both his fear when he trips over a small bump in the floor and his racist disgust at being touched by his human domestic servants and another where a different one uses them to erase the sadness of his girlfriend [[OutWithABang dying of a heart attack during sex]].
* {{Transhuman}}: The entire basis of the book is this as it details what humanity might appear as in the future via process of natural evolution. However the argument can also be made that according to the literal meaning of that term "Transhuman" is supposed to be something above or beyond ordinary human levels and the majority of human species that are shown seem to barely have any real human sapience or ability.