Why is oxygen scarce and carbon dioxide increasing?

Oxygen is becoming scarce on the planet, and carbon dioxide levels are rising because the planet itself has entered a stage of declineBecause the nutrients of the earth itself are limited, the nutrients that can be created by plant activities are also limited, but now that the number of organisms on the earth is increasing, there is no way to meet such a large demand. <>

The age of dinosaurs that is relatively close to people, about 65 million years ago, at that time the volume of animals was generally larger, what we can see is that the skeleton of dinosaurs is very large, at that time the oxygen content was much higher than now, and now the oxygen content may only account for less than 20%, but at that time the oxygen content may be 30% or even 40%, the oxygen content is more sufficient, then the animals can get more nutrients and their volume will become larger. Because the larger the volume, the more you have to have the knowledge of nutrientsThere is enough oxygen to provide them with enough nutrients, and now the size of the animals is getting smaller and smaller, which is also related to the decrease in oxygen levels. <>

Because the number of organisms on the earth is becoming more and more, the number of simple human beings may have exceeded 7 billion, and the vegetation area on the earth is becoming smaller and smaller, and the fewer the number of forests, the weaker the earth's ability to produce oxygen, so that the two-phase force naturally causes the gradual decline of oxygen content. Because people can only use oxygen when they breathe, other gases are discharged, such as nitrogen, but in the process of breathing, people will absorb oxygen to produce carbon dioxideSo the amount of carbon dioxide on the earth is becoming more and more, and carbon dioxide causes the greenhouse effect, so the glaciers are melting more and more areas. <>

The decline in oxygen levels on the planet is inevitable, at least in the short term, and the problem of declining oxygen levels will need to be solved if humanity is to achieve more long-term development. Because when the oxygen content is low to a certain extent, the human body will become smaller and smaller, because the oxygen content is low, we can't maintain such a large volume without getting enough nutrientsSo this is a big problem, human science and technology may be gradually developing, but if the environmental problem is not solved, no matter how much science and technology develops, it is useless.

Because the vegetation on Earth is decreasing, plants can undergo anaerobic respiration to absorb carbon dioxide and produce oxygen.

Because what we breathe in is oxygen, and what we exhale is carbon dioxide, only in but not out, and there is another reason why the greening is gradually decreasing, and the environmental pollution is serious!

In recent years, the Earth's temperature has risen gradually, accompanied by the consumption of oxygen and the production of carbon dioxide.

In the early days, there was no oxygen or carbon dioxide on Earth.

The concentration can be as high as 98%, and this statement is correct, which is explained as follows:

Because there was no oxygen in the atmosphere of the early earth, life at that time was anaerobic, for these creatures, oxygen is really "poison", but for the vast majority of life on the earth now, oxygen is an indispensable necessity, saying that oxygen is a "chronic poison" is just grandstanding, if there is no oxygen, now life on the earth is still a simple structure of archaea!

So, what happened to cause oxygen to begin to appear in the Earth's atmosphere?

The simplest and most direct reason is that there is a creature that has evolved a unique skill "photosynthesis, cyanobacteria."

This organism is a primitive prokaryotic life, but this organism can do photosynthesis, and cyanobacteria do not have chlorophyll.

But they can still do oxygen-based photosynthesis.

The emergence of cyanobacteria has made the earth collapse from oxygen-free and hypoxic to the modern earth with sufficient oxygen content, and the emergence of oxygen is one of the basic factors in the complexity of life, as evidenced by the fact that eukaryotic life is generally larger than prokaryotic life.

In addition to cyanobacteria, there were some environmental changes that took place before the Earth fought back, and there was a lot of "methane" in the ocean mold at that time.

bacteria", these bacteria release methane in the process of metabolism, and the appearance of methane inhibits the increase in reducing oxygen, and at the time of the great oxidation event, the element nickel in the Earth's strata.

Dramatically reduced, these nickel elements are extremely dependent on methane bacteria, so it's not just cyanobacteria that are releasing oxygen and greenhouse gases.

It is also relatively reduced, providing a more suitable basis for the increase of oxygen.

With the continuous improvement of our living standards, people's concept of life has begun to have a certain change, and now there are many people who will choose some relatively low-carbon travel methods for environmental protection, such as taking public transportation, etc., so the so-called carbon in low-carbon life refers to the most common carbon dioxide in our lives, many people think that carbon dioxide is a greenhouse gas, and there are only disadvantages to our environment, so is it really a good thing to have more oxygen? Scientists said: Then you have never seen what the earth is like when there is a surplus of oxygen.

According to scientists, hundreds of millions of years ago, before human beings appeared, the earth experienced many special periods, including a period of excessive oxygen content and excess on the earth. During that period, plants on the earth grew wildly, and then released a large amount of oxygen under photosynthesis, and the earth at that time can be said to be completely encapsulated in oxygen. Seeing this, some people must wonder, isn't it good to have more oxygen?

Now it is the amount of carbon dioxide that causes the greenhouse effect, and it stands to reason that more oxygen should be more conducive to the survival of animals and plants.

That's right, high oxygen content is conducive to the survival of animals and plants, so at that time the earth was everywhere in the enlarged version of various animals and plants, now many people will be startled when they see spiders, that is, you have never seen a spider bigger than a person. At that time, the plants were also very large, they were constantly absorbing carbon dioxide, and then releasing a large amount of oxygen, so the earth at that time can be said to be "full of life" like never before.

Under this vicious circle, we humans could not be born at all, so the ecological environment at that time made its own adjustments, that is, the so-called biological chain, a large number of herbivores appeared, herbivores ate most of the plants, and then carnivores ate herbivores, so that after a long time, the oxygen content on the earth-air counting ball gradually dropped to normal levels. Therefore, it is an eternal truth that things must be reversed, whether in life or in the ecological environment, whether in ancient times or in modern times.

The reasons for the decrease in carbon dioxide in the primordial Earth's atmosphere are: the formation of chalk rocks, the formation of coal, and the formation of oil

Since the beginning of life on Earth, the amount of carbon dioxide in the atmosphere has fluctuated, ranging from high to low, and there is no single trend. Today, the level of carbon dioxide in the atmosphere is historically low-to-medium.

4.6 billion years ago, the Earth was born. 3.5 billion years ago, life appeared. Three million years ago, humans walked upright. We look at the evolution of the atmosphere from the birth of the earth.

Atmospheric evolution. The evolution of the Earth's atmosphere has gone through three stages.

1. Primitive atmosphere: 4.6 billion years ago.

The primordial atmosphere was composed of nebula gases, mainly hydrogen, and possibly simple hydrides such as water vapor, methane, and ammonia, similar to today's gaseous planets Jupiter and Saturn.

2. Secondary atmosphere: 4.5 billion years ago - 2 billion years ago.

The gas produced by volcanic eruptions, the gas produced by asteroids hitting the Earth, forms the second stage of the atmosphere, which is mainly composed of nitrogen, carbon dioxide, and noble gases. Most of the carbon dioxide dissolves in water and reacts with calcium and magnesium metals to form carbonate rock deposits.

As early as 4 billion years ago, the basic characteristics of the carbon cycle were established.

3.4 billion years ago, the main part of the secondary atmosphere was: nitrogen.

3. Present atmosphere: 2 billion years ago to the present.

Life appeared 3.5 billion years ago, and until 2.5 billion years ago, there was no oxygen in the atmosphere. From 2.5 billion years ago to 100 million years ago, life was large**, and algae such as cyanobacteria, which produce oxygen, flourished, and oxygen increased dramatically.

It is widely believed that this will lead to an increase in the Earth's temperature, but some scientists have pointed out that the increase in carbon dioxide will lead to faster growth of above-ground plants, increased food production, increased oxygen production and reduced greenhouse effects. It's just that this effect is not noticeable due to the anthropogenic destruction of the forest. Therefore, we should protect forests and should not limit carbon dioxide emissions.

The so-called greenhouse effect refers to the fact that the sun's short-wave radiation can be injected into the ground through the atmosphere, and the long-distance and short-distance radiation emitted by the ground is absorbed by the atmospheric dioxide, tardination carbon and other substances, resulting in the effect of warming the atmosphere. Carbon dioxide in the atmosphere is like a thick layer of glass that transforms the earth into a large warm room.

Plants grow faster, and in 50 million years we have a lot of coal. We must know that carbon dioxide concentrations on Earth are now more than 20 times higher than in several coal-forming periods. This is the time when carbon dioxide levels are lowest on the planet.

Don't tell me what's going on in millions of years. Now it is the fourth time that it has lasted tens of millions of years. The period of Ji Dabing is a special period, and the increase in the current concentration is only the bottom of the valley.

In addition to greenhouse gases, such as carbon dioxide produced by chemical energy, the greenhouse effect also causes the temperature of seawater to rise. The melting of snow and ice in the Arctic and Arctic summers leads to an increase in sea water, warmer sea temperatures, warmer climates, changes in atmospheric circulation, and more severe weather, such as typhoons in the summer. More natural disasters have formed.

Summer land warming may exceed the temperature to which humans can acclimate, and many people may die from the heat. The warming of the sea is not only the greenhouse effect, but also in the Arctic and the Arctic, an increase in summer sunshine. This is the reason for the movement of the solar system.

The reason for the rising carbon dioxide content in the air is mainly due to two aspects: with the rapid increase of population in China and the rapid development of industry, the amount of carbon dioxide that is discharged into the atmosphere has increased accordingly; In addition, due to the massive deforestation, the carbon dioxide in the atmosphere that should be absorbed by the forest is not absorbed, and the greenhouse effect is also increasing due to the gradual increase in carbon dioxide.

The main consequence of increasing levels of carbon dioxide is the greenhouse effect.

The increase in CO2 will not only contribute to global warming, but will also cause the adjustment of global atmospheric circulation and the polar expansion of the climate zone. In the mid-latitudes, including northern China, precipitation will decrease, and evaporation will increase due to warming, so the climate will become arid. The adjustment of atmospheric circulation, in addition to the aridification of the mid-latitudes, may also cause climatic anomalies and disasters in other parts of the world to return early.

For example, the intensity of typhoons at low latitudes will increase, and the source areas of typhoons will expand northward. Rising temperatures can also cause and exacerbate the epidemic of infectious diseases. In the case of malaria, the incidence of malaria in the world has quadrupled in the past five years, with about 500 million people worldwide falling ill with malaria each year and more than 2 million of them dying.

The principle of the greenhouse effect.

The thermal insulation effect formed by the lack of heat convection between the confined space that transmits sunlight and the outside world, that is, the solar short-wave radiation can penetrate the atmosphere into the ground, but the long-wave radiation released after the ground warms is absorbed by the carbon dioxide and other substances in the atmosphere, resulting in the effect of atmospheric warming. Carbon dioxide in the atmosphere is like a thick layer of glass, turning the earth into a big greenhouse.

Without an atmosphere, the average surface temperature would drop to -23, while the actual average surface temperature would be 15, which means that the greenhouse effect increases the surface temperature38. The increase in the concentration of carbon dioxide in the atmosphere prevents the loss of heat from the earth and causes the earth to experience a perceptible increase in temperature, which is known as the "greenhouse effect".