What happens on Earth if oxygen levels change from 21 to 90?

<> composition (volume ratio) of the modern Earth's atmosphere is shown in the figure above, with a nitrogen percentage of 78%, an oxygen percentage of 21%, and the rest are some noble gases. Among them, oxygen is an indispensable gas for biological aerobic respiration, just like human cells consume glucose and oxygen for respiration, releasing energy and carbon dioxide. Plants and other plants need sunlight and carbon dioxide to photosynthesize and release oxygen.

As a result, the composition of the atmosphere reaches a kind of dynamic equilibrium.

For the human body, when the oxygen content is less than 10%, it will become difficult to breathe, abnormally short, and after a few minutes, it will lose consciousness and be fatal; The oxygen concentration is between 10%-19%, and you will feel dizzy, weak and tired; When the oxygen concentration is between 19% and 24%, it is the most suitable for us to live and study, and it belongs to the normal range; If the oxygen concentration reaches more than 90%, normal people can't stand it, and they will die of oxygen poisoning in a short time.

There have been times of high oxygen concentration in the history of the earth, for example, the following chart is the change in the oxygen content of the earth from 1 billion years ago to the present, about a year ago, the atmospheric oxygen content has reached 35%, the age of giant insects on the earth is talking about that period, more than 1 meter long dragonfly, more than 3 meters long horse land and several meters high pillars abound, the special respiratory system of insects can be well adapted to the high oxygen environment.

<> from this, we can know that some organisms on the earth can adapt to the hyperoxi-like environment, such as insects, because the special respiratory system does not use the lungs to breathe, which can make them larger to adapt to the hyper-aerobic environment. It is also important that if the oxygen content changes instantaneously, from 21% to 90%, then most of the life on the earth will face extinction, and the sixth mass extinction era will come, but there will be a very small number of organisms that can continue.

There is also a disadvantage of the high-oxygen environment, that is, there will be a global fire instantly, the oxygen content is too high and it is very easy to spontaneously combust, which we can't resist at all, the global fire will consume everything, but the large consumption of oxygen and the release of carbon dioxide will change the oxygen concentration. But in any case, humans will not be able to adapt to such an environment for a period of time, unless they can survive for hundreds of thousands or even millions of years, and may survive through evolution.

As long as the change in the environment is not a drastic change, then the organism has the ability to survive, but if there is a drastic change in some important factors, a mass extinction event will occur. It's like there have been five mass extinction events on Earth, all of which were caused by environmental upheaval. What better way can humanity continue?

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A: If the oxygen level changes from 21% to 90%, it will be a catastrophe for humans and the vast majority of animals. Humans cannot survive in air with 90% oxygen.

Then there is the high concentration of oxygen, which is easy to cause fire.

Then there will be the possibility of a fire, because a large amount of oxygen is formed immediately. It will provide fire energy, so that the fire will burn, and then human beings will also become extinct with other animals.

If the oxygen content of the earth becomes 90%, most living things will suffocate and die of breathlessness and become extinct, and as time increases, the earth will become a fireball and burn everything up.

In this way, it has a combustible effect, and then it can cause fires in many parts of the earth. Think about what would happen if such a fire burned all the time? Then it is perdition.

If such a change happens, then the whole earth will not be able to breathe, and human beings will face a phenomenon of death, which is very terrible, so don't let such a thing happen.

In the composition of the earth's atmosphere, oxygen can definitely be called the "first brother", because oxygen is not only the basis of respiration for the survival of life on earth, but also the key to affecting the earth's heat. Although oxygen is not a greenhouse gas that directly traps heat, its concentration in the Earth's atmosphere can significantly affect the amount of sunlight reaching the ground, and this effect can change the Earth's climate more than modern greenhouse gases.

According to statistics, oxygen currently accounts for 21 of the Earth's atmospheric gases, and all life on Earth has adapted to this concentration, but the amount of oxygen has not been constant throughout the history of the Earth. In the first billions of years of the Earth's existence, there was almost no oxygen in the atmosphere, and it was not until about 2.5 billion years ago that photosynthetic cyanobacteria began to release oxygen into the atmosphere, although oxygen was originally just a waste of photosynthesis and did not participate in the life cycle on Earth, but this situation has changed completely over time.

As cyanobacteria release more and more oxygen into the atmosphere, new life forms gradually begin to use oxygen during respiration and photosynthesis, which leads to a continuous increase in the oxygen content in the atmosphere, and eventually triggers a large oxidation event. About 2.6 billion years ago, the amount of oxygen in the atmosphere increased from a low of 10 to a high of 35, which eventually caused changes in the Earth's climate, prompting the extinction of some organisms and the birth of new life forms. It can be seen that the oxygen concentration can determine the life form of a certain era on the earth, and this concentration does not need to be 90% at all, and the effect of more than 35% is obvious.

Oxygen's impact on life on Earth is not just about breathing, it's about sunlight. Increased oxygen levels thicken the atmosphere, reducing sunlight reaching the Earth's surface, and decreasing sunlight causes less water to evaporate, reducing air humidity. Since water vapor is a greenhouse gas that effectively traps the earth's heat, when the humidity drops over a large area, it will cause the earth's temperature to become lower, and many tropical organisms will die.

In addition, lower humidity and temperature will also lead to less precipitation, creating a vicious cycle of water scarcity on Earth, where large areas of desert will be born and non-equatorial regions will no longer be suitable for survival.

In fact, instead of rising, the level of oxygen in the atmosphere is declining, even if it is very slow, less than 1/100,000 per year, which is not enough to affect the climate of the modern world, but if you give the earth another million years, maybe when the oxygen concentration decreases to a certain level, the earth will become extremely hot, and then there may be different biological cycles.

The earth can become a sea of fire, because when oxygen levels are higher, fires are more likely to occur, and they are difficult to control and people to adapt.

Then the life expectancy of human beings on the earth will increase, the population will be more and more, the aging of the population will be more serious, the load on the earth will be very heavy, and the earth's resources will be consumed quickly.

This can lead to very drastic changes in the planet, as too much oxygen can cause the death of some plants.

The earth is going to be very chaotic because the oxygen concentration increases, people get drunk on oxygen, and people get bigger and bigger.

What would happen if the Earth's oxygen suddenly doubled? We know that the composition of oxygen in the Earth's vast body is about 21%, and human beings, including other organisms, survive well in that natural environment of oxygen. In fact, this is not the case, everything has a threshold, and if you turn over this threshold, you will have a catastrophe, regardless of oxygen levels.

According to scientists' research, the natural environment of human beings and the vast majority of biological safety on the earth is above 35%, once it exceeds this standard value, oxygen poisoning, if the oxygen on the earth doubles, the composition will be 41%, exceeding the critical point of 35%, at this time the earth will enter a big cleansing.

Due to the environmental pollution of the natural environment, the carbon dioxide concentration in the air continues to rise, and the resulting global warming has led to the continuous rise of global temperature, which is very harmful, with hot weather, frequent strong typhoons, and a lot of precipitation. As the Earth's temperature continues to rise, the Arctic glaciers are gradually melting, the water level is rising, the land area is getting lower and lower, and some ancient viruses that have been frozen for tens of thousands of years will also recover. It is a disaster caused by the continuous rise in carbon dioxide concentrations, and the disaster caused by a doubling of oxygen concentrations is likely to be much greater than the increase in carbon dioxide concentrations.

The first disaster is the large-scale death of small animals, and human beings will also die, but human beings are modern civilizations, and they will immediately make plans to create some oxygen equilibrium zones, and everyone can live in them temporarily.

Doubling the oxygen content will not solve all animals, there are some small animals that are likely to be integrated into this kind of transformation to live, naturally they will also undergo some transformations, mammals are likely to shrink in size, and insects are small animals because of bronchial sucking, the exoskeleton is strong, will gradually increase, at that time you can find that insects are becoming more and more abnormally large, bees are likely to be more and more like today's domestic cats, dragonflies are getting bigger and bigger than tigers and lions, you have two dragonflies at home, It can be used as a mount when you go out.

On the other hand, mammals, such as tigers and lions, will shrink in size, and mammals will lose the advantages of food webs at this time, and the creatures at the top of power will become insects. There's a good chance that some people say how is this possible? In fact, this kind of situation is not my nonsense, but there is scientific evidence, scientists say that the oxygen content of the earth was very high at the beginning, at that time scientists called it Carboniferous, also known as the "age of giant insects" It has been about 300 million light years ago, because the oxygen content of the air was too high at that time, and the small insects looked particularly large.

Human beings often accelerate the scientific research of high-tech in outer space, accelerate the exploration of outer space, in fact, it is also a preparation for the great changes that human beings can encounter on the earth in the future, as long as human beings have the ability to work on interstellar navigation, even if the earth has undergone great changes in the future, human beings can not survive on the earth, and everyone can also take a spaceship to leave the earth and go to the universe to find a new earth.

There may be that humans will not be able to survive, animals on the earth will also face extinction, people will not be able to survive, and there will be great security risks on the earth.

Oxidation of many buildings on the earth will become very serious, and some animals and humans will have oxygen poisoning and other phenomena.

The earth will change dramatically, and at the same time, human beings will have different lives, and there may be different creatures, and new research will be provided, and other changes will occur.

If that's the case, the earth is weightless, and it's possible that you'll be floating in the air.