After Li Yang and Luo Ji hibernated, the entire Blue Star World was also undergoing great changes, due to the advent of the era of crisis, human beings began to invest a lot of resources in the military industry and space industry, which continued to break out round after round of human disasters.

In response to the invasion of the Trimaran Fleet, in the 25th year of the Crisis Era, mankind began to activate wartime control. All countries on the Blue Star have demanded that all resources be tilted towards the development of space warships and weapons, and that preparations for the Doomsday War in 400 years be made at all costs.

From that time on, all entertainment and cultural products that could not help the war effort, or even affect the people's will to fight, began to be restricted, and eventually banned altogether.

Due to the rapid development of highly polluting heavy industry in the space force and military industry, it has led to environmental degradation. However, before the grand goal of the Doomsday War is met, all the demands for environmental protection will be regarded as capitulation factions bewitched by the forces outside the Blue Star, or the party that thinks that environmental protection is a leading party that makes it more comfortable for the Trisolarans to occupy the earth, and in the end they are all considered traitors to ETO.

Under the high-pressure logic of "protecting the environment is equal to the enemy of mankind", all doubts about environmental protection and even wartime conditions have gradually disappeared.

The military and space industries developed by integrating the resources of the Blue Star have caused the Blue Star to produce high pollution in a short period of time, and at the same time, various extreme conditions have appeared under the greenhouse effect brought by high pollution, and the desertification of the land of the Blue Star has begun to intensify, and the grain production has decreased, which eventually led to a large-scale famine.

As for Huaxia, Li Yang had passed the Qi with the high-level in advance before hibernation, so the famine problem in Huaxia was relatively lower than the average level of the all-blue star.

Then came social unrest, displacement of people, the collapse of many positive and negative situations, and the situation became a common phenomenon. Natural and man-made disasters under this all-blue star have caused the world's population to drop from 8.3 billion to 3.5 billion in 50 years, of which 800 million are in China.

People collapsed in the suffering of the Great Trough, and many people thought that humanity might perish on its own before the Trisolarans reached Earth. So they began to refuse to be the "price" in "winning the war of the people of the Trisolaran at all costs", and the wartime system collapsed.

Many years later, the Great Low Valley Monument was built to commemorate this moment of suffering. The monument is a hand like a dead tree trunk stretching upwards from the desert, making various twisted gestures towards the sky.

At the edge of the sculpture group, there is a solemn monument engraved with a line of large golden characters, the content of which is the slogan shouted by the people lying flat in suffering at that time:

"Give civilization to the years, not to give civilization the years".

After the Great Trough, human science and technology have developed rapidly, because people who have experienced the Great Trough understand that when basic life is not guaranteed, all order, ideas, and even human nature will collapse.

The big trough makes people lose the confidence to defeat the three-body people and choose to live in the moment as they want.

But at the same time, it ushered in the outbreak of the Second Renaissance, the Second Gallic Rooster Revolution, the Second Enlightenment, and the Fourth Industrial Revolution.

Under the circumstance that basic physics is locked up, mankind has made breakthroughs in applied physics, biotechnology and other fields, ushering in a new technological explosion. All the material shortages in the great trough, and even the technical barriers in the space military have all been solved.

During the trough, the development of other areas is stagnant or even regressive, except for the target areas that have almost all the resources allocated. However, many of the applied technologies are inspired by the results of cross-disciplinary research.

In a society where the social division of labor is extremely refined, it can be said that all scientific and technological achievements are standing on the shoulders of countless giants to a higher level.

And what is more worth thinking about is the great revival after the great trough.

Human self-confidence has swelled unprecedentedly, and the dream of "I will definitely be able to fight back" has been implanted in almost everyone's heart. Everyone is like a gambler, and once you win, you will have this path dependence, thinking that you can win anywhere and keep winning.

At this time, the upcoming trimaran fleet, in the eyes of humanity with Starfleet, has changed from a threat to a paper tiger, and even a joke. The idea of escapism has also changed from heresy to one of the signs of IQ, and it is not even ruled out that water droplets will give humans a 2,000-ring space firecracker.

……

In addition to the suffering of mankind during the Great Trough, ETO was completely wiped out, and its last two members, the wall breaker No. 3 Keiko Yamasugi, had been designed by Li Yang and buried in the hibernation module, while the other wall breaker was still hibernating.

At the same time, the military strength of the human space force has also begun to grow, and the construction and service of space warships have also greatly increased the confidence of mankind after experiencing a great trough, and mankind has begun to form a pattern of fleet international and blue star ground international.

Fleet International conducts daily contact with the ground international through the space elevator, and at the same time uses the three-in-one detection system prepared by Li Yang to observe the movements of the trimaran fleet, and human beings are surprised to find that many warships in the trimaran fleet have begun to lag behind, and even the warship engines have turned off and shut down.

During this time, under the leadership of Ground International, all the human beings on the ground moved to a position about one meter underground, which was also to reduce the damage to human buildings on the ground when there was an interstellar war between Blue Star and the Trimaran Fleet in the future Doomsday War.

Not only that, after a difficult period of human beings in the trough, science and technology began to develop in the direction of people's livelihood, and human beings have changed very much in terms of clothing, food, housing and transportation, with flying cars, intelligent housekeeper robots, and clothes that can automatically change shape to adapt to the body.

It's just that the price required for the development of science and technology is too great, and it is not something that human beings can bear under ordinary circumstances, and only when all mankind faces the life and death of human beings can such a powerful force burst out, and it can even be said that human beings have experienced a period of scientific and technological explosion for a short time, but it is a pity that this scientific and technological explosion only exists in the aspect of people's livelihood, and cutting-edge military science and technology are still only developing on the basis of the original basic physics.

Science and technology are developing, human beings are also constantly changing, and the feminine development of men has also accelerated unexpectedly, or the general public of human beings at this time has a collective virginization change, after all, after half a century of suffering, it is inevitable that human beings will move towards such a development direction, which also lays a hidden danger for the future human crisis, they have forgotten the danger, and pride will let them taste the price.

There is a Chinese saying that goes like this: "Although the world is safe, forgetting the war will be dangerous." Besides, there is no security in the world at this time