Questions tagged [population]

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

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2
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2answers
209 views

In a stable medieval fantasy population, what should be the yearly birth rate per 1,000 people? [closed]

For a human or human-like stable, small settlement population, living in medieval fantasy, how many yearly births per 1,000 inhabitants are expected? Assuming: There is no major epidemic. There are ...
24
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7answers
3k views

Demographic consequences of closed loop reincarnation

My question is inspired by the Tolkienesque elven cycle of rebirth, but with a twist. Suppose "elves": Do not experience aging after reaching maturity and do not die of old age or diseases Mature ...
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6answers
307 views

Best way to recolonize Earth after nuclear war?

Humans of the past, I have some very bad news. In the year 2062, nuclear war broke out and destroyed much of the Earth. But luckily, in America, we were ready. We knew war was inevitable, so we built ...
19
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7answers
7k views

How large would a mega structure have to be to host 1 billion people indefinitely?

Ruins of buildings, abandoned cities and suburbs dot the coasts of Earth's landmasses, inhabited by wild animals and the pieces of a once vibrant civilization. The oceans are relatively empty, the ...
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1answer
251 views

How quickly could we reach 1 Trillion people? [closed]

Ok, first let me explain who I mean by "we". The human race is currently at 7 billion people, but we are plagued by war, disease and many other things that hold us back and disrupt our population ...
40
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14answers
10k views

How many people are necessary to maintain modern civilisation?

Modern Earth; a series of connected events (natural disasters, mass migration, drug-resistant pandemic, collapse in biodiversity, armed conflict) have led to a significant reduction in human ...
7
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6answers
1k views

Would the US government be able to hold control if all electronics were disabled for an indefinite amount of time? [closed]

In my story (modern fiction/ apocalyptic survival fiction) an enemy of the US sets up a EMP pulsing satellite over the continental US, and before we can respond all electronic systems are shut down. ...
4
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5answers
295 views

How might Southern Ontario becoming a tech powerhouse hurt New York? [closed]

I'm working on an alternate future setting (somewhere between 2070 and 2130) in which Southern/South Western Ontario, specifically the London, ON area, becomes a tech powerhouse on par with Silicon ...
-1
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1answer
94 views

What is the number of square kilometers of crops necessary to feed a population of 100,000? [duplicate]

Yo. I have a city. Pop. 100,000. They need to eat. Due to pantheism as their government-enforced religion, they do not eat meat. I need to know how much space in square kilometers would be needed in ...
0
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2answers
130 views

What are the logistics of wiping out the current world to the point a “new” generation of humans would not be able to find it? [closed]

Backstory I have a race of biologically advanced aliens that develop by fighting, adapting, and growing immune to the current highest standards of technology a species has to offer. By doing this they'...
3
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5answers
382 views

What farming practices would allow the Earth to support a population as high as 200 billion

Welcome to the year 2170, the predictions of our grandparents were so wrong: The human population didn't cap at 20 billion, it went far past that. The global population is now roughly 200 billion. ...
23
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6answers
5k views

Would “lab meat” be able to feed a much larger global population

I read a prediction that if the global fertility rate stayed at the same rate as it was in 1995 by 2150 the population would be 256 billion people. That sounds crazy, but for my sci-fi I'm rolling ...
8
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1answer
256 views

What is the maximum size of a tribe living off of one whale per year?

A small village of ice miners has popped up in the Northern Territory. They are a mix of southern workers who integrated with the native tribes. The group subsists on the meat of a single humpback ...
6
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2answers
129 views

How can I determine the largest possible population that a ring world can comfortably support?

The gods have given up on the habital planet scheme and have decided to design this universe differently. They have filled it with a space structure called a banks orbital. These habitats are purpose-...
5
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1answer
57 views

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 ...
24
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6answers
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 ...
6
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6answers
1k views

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
219 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
610 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
251 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 ...
171
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19answers
30k 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 ...
29
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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
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1answer
144 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 ...
8
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6answers
407 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 ...
3
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3answers
240 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 ...
31
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10answers
8k views

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
148 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
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4answers
503 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
375 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
97 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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5answers
257 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
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1answer
183 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
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1answer
144 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
590 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 ...
6
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3answers
219 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
195 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 ...
-4
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1answer
87 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?
0
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3answers
378 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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5answers
288 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
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3answers
439 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
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1answer
323 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. ...
166
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23answers
38k 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
202 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
436 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 ...
-2
votes
2answers
218 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 ...
4
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3answers
494 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
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4answers
278 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 ...