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42 extinction questions.

NB: This is not a duplicate of this question, because A) it only asks to wipe out humans, not any other life-form, and B) it insists that one person must survive. The survival of anything is not ...

The last time I asked a worldbuilding extinction question, I asked on what sorts of factors would create an extinction event in which 96% of all terrestrial species and only 70% of marine species died ...

I have a generic Earth like planet, same atmospheric composition, and the same oceanic composition. The crust of this planet is predominantly silicon based but plenty of iron, nickel and copper. ...

A colony of space travelers makes their way to their new home planet. After landing and establishing their base camp, a wood worker begins to cut down trees and notices that none of the trees have ...

252 million years ago, the worst event in the history of life on Earth occurred. 70% of all terrestrial species and 96% of all marine species became extinct through, according to geological records, ...

As we all know, animals are going extinct all the time and that includes arthropods. Many scientist say that we could bring extinct species (like black rhinos, tigers etc.) back to life. I was ...

Context To revive the Carboniferous period of earth one man and a group of other scientists have been genetically engineering and breeding land arthropods into giant sizes and exotic shapes since the ...

Disclaimer : before marking this as a duplicate please take the time to read the entire question, thank you. So a bit of context, in a world similar to ours a scientist/group of scientists create an ...

All humans magically drop dead this very instant. How badly will this affect other lifeforms on the Earth? Ideas: Will nuclear plants leak radiation since there is no one left to man them? Will ...

In a world where there is ever-declining population due to a phenomenon that has no satisfactory explanation, what could cause war or large-scale armed confrontations between countries or sections of ...

If the polarity of our Earth magnetic field were to flip (oscillate) at around 1 GHz or 1 billion cycles per second, would it spell disaster to fauna and flora that depends on it for navigation like ...

Is it possible to eradicate the human race in one week? And if yes, by which way? Of course, the human race should do everything to survive. What could be more powerful than our will to survive? 1. ...

I want this world to have two things, typically on the complete opposite end of geological timescales: Land fauna is incredibly "Young" - Pretty much nothing larger than a "large" insect (Some ...

More than the threat of nuclear war, we should worry more about asteroids destroying the Earth. For the first time we could save ourselves from that happening. Take all the nuclear missiles of the ...

If the Yellowstone Supervolcano did happen to erupt within the next ten years or so, what benefits would there be to humanity? I understand that there would probably be many extinctions to other ...

Nukes are destructive, and yes, they blow up everything in range. One easy way to kill off humanity. But, say, some person comes along and looks around. He sees the imperfections everywhere and ...

I'm trying to explore the consequences of just removing humans from the ecosystem. How could I kill off all of humanity without affecting plants, other animals, etc?

I am writing a fiction set in the 'dark ages', a pre-industrial, pre-gunpowder world. On Earth that would be no later than 800 AD, but this doesn't have to match Earth. There is no magic, and I won't ...

So.. I've decided to kill all the humans on Earth. Just a routine fumigation prior to a terraforming job. Although I don't mind a bit of collateral damage I do want to keep most of the plant life ...

You are standing on the ground and a meteor 6 miles wide is hurtling to earth. It will wipe out 50 - 70 % of life. Short primer on meteor impact on a nice planet. You know much about this event, ...

The story is in contemporary earth and with same technology. How can a single human make the Yellowstone explode with the tools available to us now (or with slightly advanced ones, but nothing too sci ...

So an asteroid cluster wipes out 95% of life on earth. It kills all carnivores, most herbivores, and almost all of photosynthetic life (Humans survive but I am concerned on non-intelligent life). The ...

This is possibly not quite the right place to ask this question but it's fundamental to the world I'm working on so here it is; if faced with a potent existential threat, in the form of an outside ...

I am thinking about a realistic Earth scenario following total economic/social collapse as well as mass extinction of humans on Earth (90%+). The scenario involved "stragglers" who try and eek out ...

I got this really interesting setting where Humanity is reduced to a few shattered outposts in hiding and a community that has fled to take refugee into an isolationist alien empire. But I'm having ...

So in this scenario everybody over the age of fifteen years has suddenly died of an unknown cause (I don't think it's relevant, but not an infectious disease). The event refers to the deaths of all ...

Any kind of annoying pest really, but I chose arthropods because I hate them. And someone else hates them too. Let's say he's some sort of well-intentioned but reckless mad scientist who really needs ...

Over the course of history, humanity has faced a number of epidemics, some have even lead to the mass death of many people throughout the world. Surely though we are advanced enough to cope with ...

If a species of dinosaur were to have evolved intelligence and tool use, and had managed to get from there to technology that could wipe out all dinosaurs within 50000 years, would there be any ...

How plausible would it be for an asteroid impact to create a hole through the Earth's crust into the mantle? What sort of traces would such an impact leave behind? Would it be survivable by at least ...

I'm trying to come up with a sequence of events that would render humanity extinct without killing off all vertebrate life. I'm starting with the assumption that this is modern humanity and that it ...

The rebel criminal committed something terrible that gave them their fate to be stranded on the planet. The other survivors believe that he is the one to blame since he's the only person from an anti-...

252 million years ago, Earth underwent its worst, most violent chapter in the form of the Permian-Triassic extinction event, or "The Great Dying". 70% of the terrestrial species and 95% of the marine ...

Has a species known about its own extinction, and did the species go extinct? If this has never happened, why do humans make the effort to avoid extinction if they don't know how it will actually ...

Cobaltduckworlda has had somewhat of a similar biological past as earth, but not exactly. As examples, sentience has happened multiple times, and not just in primate-like species. Beasts that didn't ...

Stephen King's short story "Trucks", which can be read almost in its entirety here, depicts the beginning a world where trucks have been given sapience by an unknown force. Here's what we know: Only ...

I am trying my hand at a matriarchal society (human beings, technology similar to Earth's 13th - 16th century), and I find that for that to work they will need reasonably efficient contraceptives (and ...

Some Background Details In 1908, the Siberian region of Tunguska made headline news when an explosion knocked down 80 million trees in an area of only 770 square miles. The mystery was that there was ...

In my world, days last 9 years. The most realistic solution is for life to have evolved before the days were 9 years. My original idea was to have a passing body slow the day down, but the reality is ...

In the world I am designing, the days last 9 years. The main problem I had was how life could have evolved on a world like this. An easy solution is to have the world start having 9 year days after ...

A group of biosphere conservation activists from a type three civilization come across the earth. Using their technology and observations, they see that throughout human history , humans have ...

I am a mad scientist who has discovered a way of efficiently killing all sorts of annoying flies, from mosquitoes to fruit flies, and want to unleash my creation upon the unsuspecting buzzers. However,...

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