If 71% of the earth’s surface becomes land, can human beings survive?

This paper takes part in the series essay competition of “great science” of Recordunkown.

The earth is a beautiful ecological planet. Standing in space, we can easily see that it is very different from other planets. If you compare the eight planets together, you will find that the earth is like a gem, emitting blue light, while the other planets are very dim, no light, which may be the characteristics of life planet.


If the earth can become a planet of life, it must have all kinds of conditions for the birth of life. Among these numerous conditions, water is an important factor. For life on earth, water is the source of life. The earliest simple life was born in the Ocean 4 billion years ago. After continuous evolution, some marine organisms went to the land, and then there was the later land life and the birth of human beings.

Through the study of various organisms, it is found that the main substance in the organism is actually water. For example, 70% of the substance in the human body is water. We often say that women are made of water, but men are also made of women. Most of the substances in various organisms are water, which shows how important water is for life on earth.

The earth can form a beautiful ecosystem in 4 billion years, which is also closely related to water. We all know that 70% of the earth’s surface is ocean, and only 30% is land. How did water come from the early Earth? At present, there is no final conclusion. Some scientists believe that the early comet impact on the earth brought water, while others believe that the earth itself evolved water.


Anyway, 70% of the ocean area gives birth to this beautiful planet of life. So someone asked this question: if 70% of the earth’s surface was land, what would the world look like? Can human beings survive?

The opposite of ocean area and land area will undoubtedly have a very serious impact on the earth’s ecology. Although at that time there was still 30% of the earth’s ocean area and it could still maintain the basic living conditions of life, the environment would become very dry and rainless after the ocean area was greatly reduced.


As we all know, due to the existence of the ocean, the earth’s environment is relatively humid on the whole. A humid ecological environment is very important for life and human survival. However, as the sea area is reduced to 30% and the land area is expanded to 70%, the temperature of the earth will change greatly at this time. Generally speaking, the temperature will become much higher than it is now.

I believe many friends know the concept of specific heat capacity, which refers to the amount of heat a substance can hold. Heat is transferred between two objects, which is called heat transfer. Some objects can absorb a lot of heat, and their surfaces will not get hot easily. Just like iron and soil, iron will get hot quickly in front of the same temperature, but soil is different. This is because iron can absorb less heat than soil, so iron tends to get hot.

And water is a very easy to absorb heat material, so in coastal areas, the temperature difference between day and night is relatively small, and because sea water can absorb a lot of heat, so the temperature of the earth can maintain a stable, can be better adjusted. An important role of the ocean is to regulate the temperature of the atmosphere. However, if the area of the ocean is exchanged with that of the land, the temperature regulation function of the earth’s atmosphere will be greatly reduced.


At this time, the temperature of the earth will rise a lot, drought and less rain will become a common thing. If there is no rain, the air temperature on land will be very high, and forests and vegetation will be prone to fire, which will further worsen the earth’s ecological environment. Many lives may not survive and die out.

If you are a careful friend, you will find that the water content in the earth’s organisms is very close to the area of water on the earth’s surface, which is about 70%. Is this a coincidence? There is no absolute coincidence on the road of life evolution. It seems to be a coincidence, but it is not.


Water plays an important role in the evolution of life from 4 billion years to the present. Water participates in the evolution of life, and water is a very important part of the ecological environment. Therefore, under the law of survival of the fittest in nature, life needs to form a perfect combination with the earth’s ecology. Therefore, in the process of evolution, 70% of the material in life is water.

Only by forming a perfect fit with the ecology of nature can life survive better, otherwise it will be eliminated by nature. Now the ocean area has changed from 70% to 30%. Do you think life can adapt? I’m afraid it’s very difficult to adapt. At this time, it will lead to a large amount of water loss in the body of life, and finally endanger life.

So, we can imagine that when 70% of the earth’s surface becomes land, it will be a biological catastrophe. A large number of surface life will be extinct because of this. Even intelligent life like human beings may be completely extinct without the help of science and technology.


Even with the help of science and technology, human survival on the earth will face many difficulties. Now the greenhouse effect makes us feel more and more difficult to adapt. When the land becomes 70%, the greenhouse effect may be more than ten times more serious. In this high temperature environment, although the earth will not become a desert planet like Mars, the ecological environment will also change greatly The desert area will be larger and larger, and human survival will be more and more difficult.

Of course, this situation is the terrible result of the exchange of the ocean area of the earth with the land area. However, if 30% of the oceans and 70% of the land are fixed when the earth’s ecology is formed in 4 billion years, the situation may be completely different.


Some people may say that if the sea and land on the earth’s surface were exchanged 4 billion years ago, life might not have been born. Is this really the case? In fact, this kind of cognition is not completely correct. Water is the source of life. Although the surface of the earth was only 30% of the ocean area at that time, it still has the hope to breed early life.

However, because the area of the ocean is less than that of the land, the early life born in the ocean may not have evolved as many species as it is now. As long as early life can be born in the ocean, there is still hope to grow into higher life through evolution, and finally intelligent life will be born.

However, for the organisms that have evolved in this ecological environment, the proportion of material water in their bodies may not be the current one, but only 30%. If the proportion of water is reduced by more than half, the ability of high temperature resistance will naturally be improved. Life can also survive in high temperature and drought. If intelligent life is born, it can also adapt to the harsh environment of high temperature and drought.


Through the above analysis, we understand that the evolution of life is closely related to the ecological environment, and what kind of ecological environment structure will evolve into what kind of life. If on the road of evolution, the ecological environment has undergone a thorough change, then life will be difficult to adapt, which may lead to mass extinction.

Therefore, 70% of the earth’s oceans were formed billions of years ago, which can not be easily changed. If the area of the oceans is greatly reduced, it will be a terrible disaster for terrestrial organisms and human beings. Therefore, we should protect the earth’s ecology, especially the ocean. Only when we protect the ocean, the earth’s ecology will not have disruptive changes, thus endangering human civilization.

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