[The story of the Muba people, who almost wiped out the entire planet's species, has not stopped, and their development of dominating the planet has not been smooth sailing since then. 】

[Because a large amount of carbon was absorbed and solidified by vegetation before, when the vegetation died and buried deep underground with geological activities, the carbon gas content in the atmosphere did not rise as high as the Muba people expected. 】

[As a producer, the life span of the Muba people is very long, and even with the passage of time, the life span of the Muba people, who enjoy almost the sunshine of the entire planet, has gradually evolved from thousands of years to 10,000 years, and the increase in life expectancy has brought about the rapid expansion of the entire population. 】

[History seems to repeat itself, less than 10 million years after the end of the species extinction action, the carbon gas in the air is rapidly declining with the reproduction of the Muba people, but it was all vegetation species that used to absorb it, and now it has become the Muba people themselves absorbing it. 】

[The thinning of carbon gases has exacerbated the conflict between the Muba tribes, and all Muba people understand that it is these same kind that absorb the carbon gas in the air.

Of course, they didn't know what carbon was at that time, what carbon monoxide was and carbon dioxide, they just realized that the carbon in the air was quantitative, and the more people there were, the less they shared. 】

[Tribal warfare does not solve the problem, because the life span of the Muba people is too long, and the offspring reproduce once every 3 years, and the number of points lost in war conflicts is not worth mentioning compared to the number of new generations. 】

[The carbon gas in the air is still irreversibly declining, and the survival pressure felt by the Muba people is increasing, and under the influence of this, the Muba people begin to consciously suppress their reproductive instinct and begin to reduce the reproduction and birth of offspring......]

"This!"

Seeing this, everyone in the Mars exploration program looked at each other, how could this situation be so familiar.

[With the passage of time, more and more Muba people began to suppress their reproductive instincts, and the growth curve of the offspring of the Muba people developed from a slow decrease to an avalanche decline, and finally gradually evolved into a negative growth in the population. 】

[The behavior of the Muba people to inhibit reproduction is becoming more and more intense......]

[We investigated a large number of Muba fossils during this period, learned more about the situation of the Muba people at that time, and found that there were even many faults in the reproduction and inheritance of the Muba people at that time, that is, in a certain period of nearly a thousand years, the number of offspring was less than one thousandth, and in some areas it was even less than one ten-thousandth. 】

[A tribe of 10,000 people, there are no 10 new offspring born in a thousand years, and even a tribe of 100,000 people has not had 100 offspring born in a thousand years, if it is not for the lifespan of the Muba people has evolved to more than 10,000 years, these faults alone can make the Muba people enter the species extinction. 】

[Hundreds of thousands of years have passed, the carbon gas content in the air is still at a low point, and the macro number of Muba people has also decreased by about 35 to 45 percent......

What's even more terrifying is that we carefully studied the situation in that period and found that in addition to suppressing the reproductive instinct, the physical elements of the Muba people in that period were also unbalanced and sub-healthy, and their mental state was not so active, the range of activities was shrinking, and their mental state was becoming more and more withdrawn.

They began to gather together in groups and start wars with the Muba people of other tribes, and gradually became alone and quietly rooted, alone and quietly waiting for death......]

"East Island Country!"

"Modern humans!"

Seeing this, some researchers of the Mars exploration program finally exclaimed uncontrollably.

The Muba people in the video are similar to modern humans, but the Muba people are due to the increasing pressure of carbon gas and survival.

However, due to the solidification of social class, young people's upward channels are decreasing, but consumption is increasing day by day, resulting in the increasing pressure of life.

When the pressure of survival and life is increasing, in order to ensure their quality of life, life will seek advantages and avoid disadvantages, subconsciously inhibit reproduction, and the population begins to enter irreversible aging.

This trend has been seen in the eastern island countries for decades, and the proportion of Dinks in society as a whole is rising, and the population is aging more and more.

In order to increase the fertility rate, the government of the eastern island country has tried all kinds of methods, and the implementation of various policies has not been able to change this situation.

Some scientists in the world have predicted that in another 200 years, the eastern island country may become the first nation to die out naturally.

Even at this stage, this trend has begun to emerge in Huaguo, the two-child policy has been liberalized for several years, and even the policy has begun to encourage the second child, and the proportion of families willing to have a second child is very small.

What is even more worrying is not only that the post-80s generation does not want to have a second child, but even more and more post-90s generations do not want to get married, and even if they are married, they are not very willing to have children.

"Lu, Su, do you have any impressions of the infinite reproduction experiment of the historical Balb C guinea pig?"

Professor Hill looked at the Muba people who were basking in the sun in the video screen, waiting for death silently without fighting or moving, and asked Lu Yi and Professor Su, who looked a little solemn.

"You know, a classic biological reproduction experiment in the 60s of the last century is also considered to be a form of existence of the large filter.

The fundamental reason for this change trend is that life feels the pressure of survival and the improvement of life pressure, in order to ensure the quality of life spontaneously produces a kind of profit-seeking and disadvantage-avoiding behavior.

Then, under the influence of long-term stress and the inhibition of the reproductive instinct, the state of health and mental state also changes, and begins to gradually weaken or even lose social functioning.

To change this behaviour and situation, it is only necessary to break the pressure on the people.

Reproduction is an instinct imprinted in the depths of genes, and it is a rigid need of every life, when the pressure on the body is broken, without deliberate guidance, the people who still have the ability to reproduce will spontaneously begin to reproduce. ”

Lu Yi exhaled deeply and said: "This is a problem of social system and social science, and it is not a problem that those of us who study physics, spaceflight, and the origin of life on planets can consider.

This one problem, this big filter, we didn't have the ability to break it before, we didn't have the capital to break the increasing pressure of the people, but now we are different, we have been preparing for almost a year, and I think the relevant policies should almost come out. ”

"This is also the credit of Commander Lu."

Professor Su sighed with emotion and said: "If it weren't for the breakthrough of controlled nuclear fusion, the government would not have been able to change the whole trend of change, after all, with the progress of the times, people's needs and desires are also increasing."

If there are fewer policy subsidies and cannot alleviate the pressure on people's lives, it will not help.

If the policy subsidy is high, the national economy will be overwhelmed and the resources will not be satisfied.

That is, the breakthrough of controllable nuclear fusion, the government can have enough resources to regulate and solve this problem, nuclear fusion is not only the key to the starry sky, but also a new driving force to alleviate and solve social contradictions. ”

Civilization is progressing, and so are the needs and desires of people's hearts.

100 years ago, everyone was satisfied with being able to eat enough every day and be warm in winter, and 60 years ago, everyone thought that they would be satisfied if they could eat white rice every day instead of eating sweet potatoes and sorghum every day.

Thirty years ago, everyone's needs no longer stopped at white rice, but thought that they would be happy if they could eat meat once a week or half a month.

Today, every day, there are many fish and meat, all kinds of bright clothes can not be changed, but what I think about is the car and the house, with the car and the house, then I have a different idea, to luxury cars, luxury houses, cruise ships, etc......

The desire for intelligent life can never be satisfied, which is not only the driving force of civilization, but also the barrier in front of civilization.

PS: In the 60s of the last century, American ecologists conducted unlimited breeding experiments on mice in Maryland, and if you are interested, you can search for relevant information.

The inspiration for this book can be said to come almost all from this experiment, and at the same time, this experiment can be regarded as an explanation of the phenomenon of the low fertility rate of modern human beings from one perspective, if there really is a big filter, then I think this experiment should be one of the forms of existence of the big filter.

What has come to the light of this experiment is not only a problem of social resources, but also a problem of social system and social structure.