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The earth has gone through many rounds of civilization, or many rounds of life, because dinosaurs existed before humans as we know it, but the earth can still recover because the environment in which the earth's creatures exist has not been destroyed, such as the atmospheric magnetic field.
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Because the most fundamental difference between the Earth and Mars is that there is an environment on the Earth where organisms can reproduce, and there is no air suitable for the reproduction of organisms on Mars, so life cannot be born on Mars, and there is no such concept of reproduction.
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The biggest difference between Earth and Mars is that the Earth has a natural protective film of the atmosphere. At least not completely exposed to the universe like Mars. Therefore, the earth with super protection on the outside will naturally recover quickly on the inside.
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Because Mars is a planet with no magnetic field, then it is full of ice. In this way, they cannot be converted into liquid water, and there is no carbon dioxide, which does not provide more energy for plants and animals to survive.
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Mars is a planet without any magnetic field, and the environment for the reproduction of organisms on the earth is actually unsuitable, and the existence of organisms on the earth has not been destroyed, so many rounds of civilization still exist.
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Before the advent of humans on Earth, dinosaurs had dominated the Earth for hundreds of millions of years. But have you ever imagined that if human civilization disappears from the face of the earth one day, what legacy information will be left for future life?
According to scientists, it will only take 200,000 years for human civilization to disappear after it disappears.
Suppose that human civilization disappears someday in the future, and all man-made facilities will not be able to survive on Earth. The lights of 10,000 homes will cease to exist in the first place. Because there is no power supply, it only takes a day for any artificial light source to go out.
Then there are roads and arable land, which will be wiped out in a matter of months, and country roads will be wild in 20 years, while streets and roads in the metropolis may take a little longer, 50 years. Among human dwellings, wooden buildings decay the fastest, and it only takes 100 years for them to be eaten away by insects.
After 200 years, glass and metal buildings such as the Eiffel Tower will be destroyed, while masonry and concrete buildings such as the Skyscraper Crash Building may remain for a while longer. The pyramids are not immune, and by the end of the next millennium, they will be reduced to dust.
As for the various chemicals, the impact of greenhouse gases such as carbon dioxide on the climate will continue for another 100 years; After 1000 years, the Earth's atmosphere will return to its pre-industrial state. Synthetic chemicals, especially perfluorinated compounds, take up to 200,000 years to decompose, even when buried deep beneath the earth's surface.
Therefore, the archaeological traces that can be used by future generations to prove that human civilization once existed on the earth will cease to exist after 50,000 years. If aliens do come to Earth at this time, they will have nowhere to find traces of human existence. And after 200,000 years, all traces of human existence on Earth will disappear.
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<> if humanity suddenly disappears from the earth, the earth will become incredibly beautiful, which may be the thinking of a considerable number of people, especially those who have prejudices and strong resentments against humanity. But the word beautiful was originally coined by human beings, and if human beings no longer exist, what is beautiful? A world with human beings is beautiful, and a world without human beings cannot be defined at all.
So if you have a lot of prejudices about human beings, you can die for the world after losing human beings.
But what would happen to the earth if one day humans suddenly disappeared from the earth?
After the sudden disappearance of human beings from the earth, all pets, all animals that depend on humans to survive, will face a huge existential crisis, the vast majority will die in a short period of time, and those who do not die will also become a feast for other carnivores. Humans who have lost the top of the food chain will be reshuffled.
Rhinos and elephants can breathe a sigh of relief, and there is no one to snatch their horns and teeth; The foxes and martens could be relieved that there was no one to share their clothes with them; Sharks can flap their fins to celebrate, and no one will cut their fins, make them into "sharks" and throw them into the bottom of the sea to die; Bears can high-five each other in celebration, and no one will cut their paws and smoke their bile......Carnivores will regain their niche, and lions, tigers, etc., will enjoy their most comfortable time and become supreme masters in their respective territories. The same is true in the sea, where whales and sharks will also develop rapidly and dominate the oceans.
Reinforced concrete and asphalt pavement will be around for quite some time, but the plants will gradually erode their territory, and the earth may become a world of plants again in a few hundred years, and the whole earth will become a green planet again. Without the release of carbon dioxide and other pollutants by humans, the planet will evolve according to its established patterns and the climate may soon recover; Everything created by humans will gradually disappear, and almost all traces of human activity will be erased by nature within 200,000 years, including glass and plastic, which are the most difficult to dissolve. If aliens had come to Earth at that time, they might have exclamated like this:
Alas, it is inconceivable that such a beautiful and rich planet has not developed an intelligent civilization.
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I think that after the destruction of human beings, the earth will become very bleak, it will become very bad, and it will also become very dark, so I don't think there will be any new intelligent civilization.
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I think the earth will return to its original state and become an ocean. There should also be new intelligent civilizations, because the change of times, the emergence and decline of civilizations, are constantly changing over time.
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After the destruction of mankind, the earth will become very barren and look desolate. It is indeed possible that a new intelligent civilization will emerge, but we cannot be sure of this.
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It could become a planet of greenery. It is possible that new civilizations will be born, because the earth is always in rotation.
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The earth will also become bare, it will become a desert, there will be no way to survive at all, and there will be no new civilizations.
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The biggest crisis in the West has erupted, and Western civilization may be completely destroyed, and the United States has so far been helpless.
Qing and Tang Dynasty culture. Original · 2022-10-31 11:01 · High-quality creators in the field of history.
Concern. From the perspective of world history, the most helpless situation for a country or a group of civilizations is to watch the future of the country and the future of the ethnic group be lost, and there is nothing to be done.
And this kind of crisis is often not a threat from the outside, but from an internal defect. For the West, this is especially true. Since modern times, the West has controlled the world for several hundred years, and now no external force can shake it, and it is extremely powerful.
But in fact, the West is also facing a huge crisis, the most typical of which is the outbreak of the biggest crisis in the West, the Western civilization will be completely destroyed, but the United States is still helpless and helpless.
In fact, the West is very proud of it until now, because it has ruled the world for hundreds of years, and it has also brought down the powerful Soviet Union, so it has made the West even more powerful.
Up to now, the vast majority of power in the world is in the hands of the West, and the West can fight whoever it wants, and can dismantle and start wars as it wants. 
In the new book "America Alone" by a conservative scholar in the United States, a startling inference is made: Western civilization is about to be destroyed!
It should be said that the author is not deliberately sensational, nor is he unfounded. The book provides a large number of arguments to support his views. It is foreseeable that in the not-too-distant future, Western civilization will inevitably die out and go to destruction, just like the ancient Mayan civilization and the ancient Babylonian civilization, which will become a historical relic.
In fact, many of us are aware of this view, or can perceive it, but we don't.
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