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Questions tagged [population]

For questions on population sizes, maximums and minimums, how they are affected by different events, etc.

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1answer
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Could an isolated cutoff valley sustain a diversity of animals alongside humans?

My world has an isolated valley between high mountains like the Himalayas that is practically cut off from the world by high elevation mountains and steep cliffs. The valley is about five miles in ...
23
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5answers
3k views

How many people need to be born every 8 years to sustain population?

So I'm doing some worldbuilding for a small, isolated village on the coast. The winters are harsh, but making sure everybody has enough food generally isn't an issue because they have good trade with ...
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6answers
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Humanity loses the vast majority of its technology, information, and population in the year 2122. How long does it take to rebuild itself? [closed]

The year is 2122. An AI created in the year 2115 with complete, unfettered access to control of the entirety of Earth's electronic equipment has caused a mass extinction event of humanity after ...
5
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2answers
187 views

What's the minimum time that it would take for an advanced species to create an ecumenopolis?

In figuring out the rough timeline for my sci-fi, I've run into an interesting dilemma. As it stands right now, There are about 90 years in between one of my civilizations discovering space travel and ...
2
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5answers
506 views

Death from old age has stopped, but fertility window is the same. What is the new population equlibrium?

I'm imagining a near-future world where a process can be undergone that will halt all future aging of the body, but the approach causes infertility. Those undergoing it will not have (biological) ...
2
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3answers
216 views

What kind of extinction event could solve Global Warming?

The world I'm creating will be referred to as E. Current E population is growing exponentially, and the population will become completely unsustainable soon. Global Warming is also increasing ...
12
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4answers
2k views

Calculating City Size based on Population

Question: I'm trying to determine how large (geographically) my city will have to be to accommodate for 1 million people. I have a city that was basically formed by the gods to be fertile land with a ...
170
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19answers
29k views

Russian Dolls - How do they reproduce?

Warning picture showing dissected Russian Doll My theory I believe that Russian Dolls reproduce asexually. They are born pregnant. At the time of birth, the outer doll dies. What is now the outer ...
27
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25answers
9k views

Elf-like race: What could prevent overpopulation?

For an elf-like race whose people do not age beyond physical maturity (the accumulated DNA damage associated with aging does not occur), what would prevent overpopulation? This elf-like race is ...
1
vote
1answer
137 views

Counteracting Perverse Incentive effects in 1902 Hanoi rat population

A perverse incentive is a reward system that has the opposite effect to the one intended. In Hanoi, under French colonial rule, a program paying people a bounty for each rat tail handed in was ...
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6answers
360 views

How can a planet full of zombies reproduce and maintain its population?

How can we have a world that is inhabited only by zombies and yet continues to be populated? For the purposes of this question, I envisage the type of zombie that has been infected by a virus, is ...
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3answers
186 views

Reasonable maximum iron age/medieval population for small rural area

Question From around 400 BCE to 1000 CE, what could what would a reasonable greatest achievable population be – under the best of all circumstances – in a rural area of about $\mathrm{900 km^2}$ (In ...
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10answers
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In theory, could all mammals be wiped out by a single pathogen?

Pathogen Note: For the purpose of this question I define a pathogen to include viruses and/or bacteria. Edit: I don't exclude other biological agents such as fungi that might have the same effect. ...
2
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2answers
121 views

Cycle of Reincarnation - Bypassing the wait

Lets say for arguments sake, that a world, with maximum population of 5 billion, the common Joe gets reincarnated a few hundred times since the creation of humankind. This type of reincarnation is ...
16
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15answers
3k views

What could cause a baby boom across the western world?

Right now the trend in the western world is declining or stagnant birthrates, but in my sci-fi universe I wanted to have a period of rapid population growth (around the 2050s). What factors could ...
4
votes
4answers
343 views

How to mitigate high infant mortality rates in a space colony

Judging by the majority of answers from this question: What would be a logical reason to explain space based families having more children than an earth based one the spacers are going to have lots of ...
32
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31answers
8k views

What would be a logical reason to explain space based families having more children than an earth based one

In my yet to be named sci-fi universe humanity has begun to expand into space and has established large scale space stations near Earth and on places like Eros and Luna. I wanted the stereotypical "...
3
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4answers
286 views

How fast would a post-apocalyptic population grow?

Let us assume a soft apocalypse eliminating >99% of world population without any effect on infrastructures. The 1% is irregularly spread over the world. All the drugs, weapons, resources and modern ...
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3answers
96 views

Operation: Seedship [closed]

The year is some time in the future on another planet. The planet is getting overpopulated. The world leaders have convinced the people that there is no overpopulation. But they are very much ...
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votes
5answers
245 views

How can I keep the number of demigods limited, but stable?

In this world, there is a group of demigods that functions as a religious organization. This organization operates worldwide and defends the realm from threats of a demonic parallel realm. There are ...
3
votes
1answer
173 views

How long would it take to revive an extinct race of people via cloning?

So there's this planet that, several decades earlier, suffered a massive famine and drought that made habitation impossible. Everyone still alive on this planet died, except for 2 escapees, both of ...
4
votes
1answer
141 views

How to determine reasonable population density of a three-dimensional volume

I'm attempting to rough-estimate potential population density of three-dimensional megastructures in space. Assume a filled spherical volume (i.e. death star, not Dyson sphere), where all internal ...
12
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3answers
577 views

How do I calculate the number of people who have ever lived in a place over a given span of time assuming a fixed population?

500 years ago, the mountain dwelling Carac clan was cursed with undeath: whenever they or any of their descendants die, their corpses rise as undead creatures, or if burned, as shadowy specters. The ...
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3answers
205 views

How would an isolated world grow its population, then keep it stable?

The scenario In the scenario that I'm imagining, a small group of people (ideally 100 or less) travel to a parallel universe and begin a new society. The new planet that they land on has one land ...
0
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2answers
173 views

Reproduction is limited by mutation [closed]

In the year 2020, a cosmic event caused large-scale mutation in humans. Every woman could reproduce only once in her lifetime. Two hundred years later, what would be the population and composition ...
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votes
1answer
78 views

World with 2 billion people [closed]

How much would fertility rate need to drop for the world to stabilise at 2 billion people in 200 years time? Would the world with this amount of people be vastly more peaceful and prosperous?
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3answers
299 views

Every second person is gay now! How would that affect earth's population? [closed]

The villain of my (comedic) story is basically a gay Thanos, turning half of earth's population gay with a simple finger snap. Just like regular Thanos, he is concerned with the dwindling resources vs ...
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votes
5answers
252 views

What would happen if all female humans on earth died? [closed]

Say if all the female humans were infected by a disease and all of them die, as this disease affects only female. Even if some male gives birth to a female child, it will die as environment on Earth ...
5
votes
3answers
404 views

How many people need to disappear before authorities take notice of the trend? [duplicate]

Due to sensible points made in the comments, I have reworded and clarifed my question. I am trying to setup a world where due to reasons (mystical or alien) people have been going missing with no ...
0
votes
1answer
259 views

Every murderer and rapist in the world vanished without a trace. How many people is that? [closed]

In a worldwide catastrophe, every single murderer and rapist just vanished from the world at the same time. Nothing left behind, either dust, clothes, or whatever they were carrying at the moment. ...
165
votes
23answers
36k views

If everyone in the world disappeared except 35 random people, how long would it take for one of them to realize they're not alone?

Everyone suddenly disappears from earth except 35 people randomly scattered wherever they were before everyone disappeared. How long would it take on average for 2 or more people to meet? What other ...
3
votes
1answer
190 views

Largest Population for Ancient World Migration/Encampment

What is a reasonable range of number of people that could participate in a cohesive and centrally organized migration/encampment? Assumptions: Ancient times, desert terrain. People include adults ...
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5answers
416 views

What would be the human population 200 years after 8 slaves escape?

Okay so in my setting, long story short, it starts off with a group of humans escaping an alien fleet they were enslaved by and conscripted into, and they find an earth-like planet that's smaller than ...
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votes
2answers
185 views

Can a city go from a population of 5000 people to 50000 in a 600-year period?

I have a few cities in my story that have anywhere from 30000 people to 70000 people. Is it possible that these cities have blossomed to such a number in a span of 600 to 700 years? I am going to give ...
3
votes
3answers
372 views

How many troops would be needed to occupy a city with a population of 2.9 million? [closed]

I have a city that has a population of 2.9 million and an urban footprint around 2,037 square kilometres. For reasons unknown, it's been sealed off from the outside world by a shadowy military ...
1
vote
4answers
260 views

Where in Australasia can a 4.3 million strong armed force be discreetly stationed?

I have a paramilitary organisation with a 4,320,000-strong standing army stationed in Australasia supported by a sophisticated air force and a bigarse fleet. This force is commanded by two Major ...
2
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1answer
200 views

Generation ship population growth

I have taken several things into account when it comes to population growth. First off, it is likely that on a generation ship it would be 100% natural conception so I need to take into consideration ...
16
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13answers
4k views

Is a population of people with eternal youth sustainable?

Alright so in my sci-fi setting, my space faring human civilisation has a widespread procedure that allows humans a very extended time period without any sort aging or its assorted issues (weakening ...
2
votes
3answers
207 views

Generation ship: How big exactly?

So first off I will assume that the generation ship has a reasonable capacity of 1 billion and 45,000 people are the first generation on it. Also assuming an 8/1000 per year death rate(the average ...
0
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1answer
98 views

How might lions and orcs engage in warfare with one another? [closed]

There are two populations of beings in a world akin to prehistoric subsaharan Africa: lions and orcs. The orcs have essentially the same intelligence and physical capabilities as humans, but they are ...
3
votes
1answer
154 views

Agricultural population reality check

I am designing a fictional world (no magic, real-world technologies). I have an unexplained anomaly in my world: There is a natural "bold spot" in the jungle (in the thousands of square kilometers), ...
0
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5answers
239 views

Human Sacrifices and Population Growth

Does there exist a percentage of a population that can be safely sacrificed or otherwise "disappeared" and still maintain a steady population growth? For example. Could a village of 1000 people (500 ...
2
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0answers
38 views

How many people would it take to colonize Mars? [duplicate]

To ensure a self-sufficient colony, there would need to be enough people to ensure a diverse gene pool, a wide variety of technical experience, and enough bodies to work farms and such. How many ...
4
votes
1answer
198 views

With access to near-future technology, what is the largest amount of healthy children a mother could give birth to in her lifetime?

Essentially for my story my Evil Empire needs a constant and huge amount of new population to conscript for their armies. The way they accomplish this is by forcing every female member of society (...
15
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20answers
4k views

How to make people spread over the earth?

I created human beings and placed them on a planet full of landmasses, oceans, rivers, forests, desserts, swaps, snow, mountains, hills, animals, insects, plants, fish you name it. But I have a ...
2
votes
3answers
345 views

How is natality affected if sex isn't pleasurable anymore?

Worldwide, every single person stopped enjoying sex. They still get attracted sexually but sex is basically frustrating and feels like it's always uncompleted. Nobody has orgasm but still ejaculate ...
0
votes
1answer
175 views

What would population be if 1000 or 10000 people began to repopulate in 400 years? [closed]

Okay, this is going to get a bit more complex, as i am trying to find a realistic number for my story. Let’s assume they have a 50/50 male to female ratio. A few important things to throw out there: ...
2
votes
2answers
158 views

Ways to produce atmosperic aphrodisiacs [closed]

I am a big player of Stellaris and some of the planets have the modifier Atmospheric Aphrodisiac so I was wondering, how could we achieve a planet wide production of aphrodisiacs. The phenomenon ...
4
votes
4answers
145 views

What determines the number of cities and polities present in a given land area?

I'm at the point in my worldbuilding where I can kind of see the general contours of the history of the region I am working on. However, I always have trouble translating this into discrete cities and ...
0
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3answers
260 views

What classes should be included in a “restart the human race” curriculum?

I've mostly written a story from the point of view of filler programs in an online university, the characters initially existed to put human students at ease in RV classrooms with greatly diminished ...