Kuai Fei looked up at the night sky. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

The night was deep with overlapping black clouds, and the weather was not clear tonight.

Rao's five senses have been greatly enhanced, and he can't see through the flying objects at an altitude of 15,000 meters above the thick clouds.

Nothing to see. But there must be something in the air.

So Wu Dalang shouted loudly: "Dude, I can't see you." Can you come down and talk? "The other party used Chinese first, so there was no language barrier at all.

Lord Lin, who was flying in a dragon hovering in mid-air, broadcast to the ground through the ship's audio amplifier system, that is, the loudspeaker and something: "Intruder, first of all, please disarm yourself. ”

Lin Jiangwen has experienced countless dangers in his life. He himself was once a relic explorer in extremely harsh environments, a desperate adventurer. There is still a difference between daring to play with your life and stupidly sending you to death. Lin Jiangwen is not afraid of being ruthless, but he can't tolerate being attacked by a rookie because of stupidity. In the more than 200 years since the Cataclysm, survivors of the aftermath have taken refuge in the depths of the underground fortress, sending explorers back to the surface at the risk of death, trying to recall as many of the so-called "lost technological and civilizational heritage" as possible. Every year, a large number of explorers encounter various accidents and die tragically in the process of exploration.

Some died from poor preparation and poor equipment, some from daring, some from ignorance, and many from deadly sneak attacks by their own teammates. In the 24th century, the surface ecosphere in the aftermath of the cataclysm has completely refreshed the rules of the food chain. Survival for humanity has become extremely difficult. In other words, new ecosystems and new food chains are for acidic carbon-based aquariums that are smaller in size and have smaller appetites. The Earth's crust is shattered, hot magma and sulfur gases are pouring out, acid rain is falling in the sky, the composition of the atmosphere has changed dramatically, the ionosphere has become thicker, and sunlight has been unable to penetrate the thick and dark atmosphere. Humans have become an anachronistic and obsolete species.

The surface does not get enough sunlight, and the greenery is unable to restore the prosperity of the old days. As a result, the levels of carbon dioxide, carbon monoxide and sulfur dioxide have risen significantly, and the proportion of oxygen in the air has reached the bottom. The mammalian circulatory system, which is based on alveolar exchange, is no longer able to adapt to the laws of survival in the new era. The disappearance of green vegetation has also led to the total extinction of nitrogen-fixing plants, and the air now contains a higher proportion of nitrogen, making it even more difficult for human civilization to survive.

Oceans and rivers become strongly acidic, but the template of human life requires a neutral pH.

As a result, soft-bodied aquatic organisms in the form of acid slimes have flourished in the ocean, and some crustacean insects that can adapt to the environment of strong acid, high nitrogen and hypoxia have become popular on the continent.

In the aftermath of the cataclysm, most small countries suffered an irresistible extinction. But thousands of shelters, large and small, built deep underground by great powers, countries and dozens of conglomerates, have made a difference. More than 10 million lucky people and members of the social elite have been spared......

The rest of the story gets incredibly complicated. It is impossible for the resources in the underground shelter to supply the indefinite needs of tens of millions of humans. These strategic reserve resources will eventually be exhausted.

Fortunately, the cataclysmic event was delayed until the 22nd century. Had it been early in 1950-70, these shelters would not have lasted even a decade. The total amount of resources consumed by tens of millions of people in ten years is a terrible astronomical number.

Fortunately, in the 22nd century, the human science and technology industry has been able to purify and purify various air components based on oxygen on a large scale, and successfully re-proportioned them to the composition ratio of normal air. It is also possible to purify contaminated fresh water with less effort. These technologies have made the dormant period of human civilization longer. But there are still fatal bottlenecks that cause anxiety.

Until the 22nd century, human nutritionists and life experts firmly believed that the maintenance of human health and reproduction is nothing more than light energy, vitamins, CPOHM five elements, a little chlorophyll, and a number of necessary trace elements represented by zinc and selenium.

The underground eye is closed and does not worry about energy problems, civil nuclear energy is still very safe, industrial robots are not afraid of pollution, climb onto the surface world after the catastrophe, and rebuild a large number of solar and wind power generation units, completely ensuring the energy supply.

In the Underworld, simulating lighting is not too difficult. In addition to visible light, the invisible spectrum can also be artificially created. Residents of the dungeon can enjoy a certain amount of artificial light therapy.

Vegetables and chlorophyll are also not a problem. Based on cyanobacteria, the ecological cultivation center can cultivate a small number of simple green plants. Although it is no longer possible to restore the great forests and savannahs that the surface world once had. But a small-scale vegetable base or something is not difficult to maintain.

The only thing that makes life experts feel a little embarrassed is the necessary trace elements represented by zinc and selenium, this ...... The cost of obtaining it is slightly higher, but it is not a big problem that cannot be solved.

In any case, when the cataclysm broke out, in the spirit of humanitarian relief, except for the military bases controlled by the military of various countries, civilian shelters were able to accommodate as many people as possible according to their maximum capacity.

When the most terrifying death month has passed, it is time to drive some unqualified inferior humans out to explore the outside world. As a result, more than a million people have formed countless exploration teams to fight the pollution and return to the surface world to collect all the necessary resources for the lucky ones who are hiding underground. At the same time, as much as possible, the debris of various civilizations in the surface world is also collected. Although it is destined to be impossible to restore the prosperity of human civilization, it is good to be able to pick up a little bit more or less.

Then comes the real crisis.

After five or six generations of reproduction and inheritance of the lucky ones hiding deep underground, the experts of the new generation were horrified to find that the experts who built underground shelters in the 21st and 22nd centuries had made a big mistake.

What is needed for the maintenance and development of human life is not only light energy and green, but also the five elements and other trace mineral elements.

One or more other items that humanity has not been able to figure out until the 24th century are needed. THE TERM "ITEM" IS USED BECAUSE THE NEW GENERATION OF EXPERTS IS NOT EVEN SURE WHETHER THE ITEM IS A NEW ELEMENT, AN ELECTROMAGNETIC EFFECT, OR SOMETHING ELSE THAT CANNOT BE DESCRIBED. A few experts have put forward the hypothesis that this indispensable life support force may be dark matter and dark energy. But there is no evidence to support this hypothesis.

In short, the plants in the artificial vegetable cultivation base have obvious signs of degradation in terms of species.

The survivors of the new generation from the fifth generation also have a vague tendency to degenerate at the same time, and the degeneration characteristics of the sixth generation are more obvious than those of the fifth generation.

If this trend continues, it is estimated that no more than 20 generations will be inherited, and the descendants of the human race will become incurable xenomorph monsters.

A nuclear war has failed to wipe out humanity, energy is not a problem, food and air are not a problem, and it is one or more other forces that humanity has never understood that is holding the fate of mankind by the throat.

This is the real calamity.

The survivors of the dungeon sprang into action......

At least 10 different disaster relief plans have been activated......

Human beings live up to the name of "wisdom". Countless years before the disaster struck, they foresaw that they might encounter this or that kind of hardship, and meticulously prepared various contingency plans.

Project 1 was launched first, a biochemical transformation project that had previously only been tried secretly and never dared to be made public.

It seems that the underground is not going to be able to stay. Survivors must return to the surface world to avoid genetic transformation. However, the surface ecology has undergone earth-shaking changes, and it is optimistically estimated that it will not be able to recover to a condition that can be sustained by humans for the next 3,000 years. WHETHER IT IS OXYGEN CONTENT, OR PH VALUE, AND ALL KINDS OF OTHER POLLUTION, THERE HAS BEEN A HUGE QUALITATIVE CHANGE.

The surface world ecosystem can be self-consistent and self-healing in about 100 years under the minimally invasive quantitative change mode.

However, once the intensity of such a change is too large, once it changes from quantitative to qualitative, it will not be restored in 3,000 years, and it is even very likely that it will never be restored to its original appearance.

Some experts have pointed out very sharply that the state of the earth's surface world between hundreds of millions of years before BC and the cataclysmic years of the 22nd century is not the inevitable result of natural evolution, but only an unstable semi-self-consistent state that has unexpectedly evolved into the ecological environment of the blue star. Once this semi-self-consistent mechanism is damaged by too large a scale, the Bluestar ecosystem will go to another route and never look back. It is not possible or necessary to repair itself to the historical state it once was.

This means that survivors cannot wait for the biosphere to recover naturally. The day of restoration, most likely, will never come.

At the end of the day, humans are not the masters of the planet. Although human enthusiasts often shout that men conquer the world and women conquer men, in fact, humans have never touched one ten-thousandth of the true essence of the Blue Star.

If human civilization is also included in the Homo sapiens stage, it has been tossed for millions of years, but it has destroyed half of the forests on the earth's surface and killed hundreds of thousands of species of mammals, reptiles and birds. Apart from the smoky miasma, there were no major achievements.

Humanity has never conquered anything that is truly the source of life, and they have not even been able to boast of destroying the atmosphere, they have only changed the composition of the atmosphere and the pH of the oceans to make it no longer suitable for their own existence.

An atmosphere that is not suitable for human existence can actually be suitable for other species, especially a new species that can be predicted.

The strong acid sea, which is not suitable for human survival, is actually suitable for some acid-loving species, especially a new acid-loving intelligent species that is about to emerge.

The surface ecosystem is like a big stage, but it is just a new generation of actors with different attributes appearing.

This group of experts believes that humans don't have to cry out for their "sins" of destroying the environment, which is really nothing, and Gaia's mother, Izumita, should not care about these small changes.

There is no need for human survivors to pray for help from gods or alien civilizations, things are not that serious at all, this is not the end of the world, it is just a change.

It is enough to transform the old humans, who have always paid attention to the balance of PH, into a new species that likes acid.

It's as simple as that.

The technical reserves of Project 1 have been around for a long time, and its earliest ideas can even be traced back to the Dark Middle Ages. At this time, the accumulation was carried out, and this feat of human salvation was basically launched immediately.

The evil scientist who was previously suppressed as a heresy is now on the stage and presiding over the work.

But Project 1 is not the whole story.

Activists who insist on defending the dignity of human genes and sternly resist the illegal rewriting of human genetic source code by evil scientists have stood up almost at the same time.

Radicals denounce evil scientists as bio-demons and those who go berserk as "degenerates."

In contrast to the degenerates, these hot-blooded activists, call themselves "defenders".

A civil war between the fallen and the defenders is on the verge of breaking out.

However, the existential crisis of humanity has not yet been resolved, and the sword of Dacmoris hangs over the heads of all human beings, and in this sinister context, humanity should be united, and it should not start a frenzied civil war at all.

As a result, third-party "mediators" also appeared.

The mediator's call for the two sides of the civil war to put aside their dispute and seek a way out for humanity sounds magnificent, but the mediator's mediation efforts have been fruitless.

Because the total amount of resources reserved by the major sanctuary forces is limited, and the demand for resources for Project 1 and Project 2, 3, and 4 tossed out by the defenders is unlimited.

If the mediator cannot solve the problem of resource allocation, there will be no real mediation.

The civil war did not break out on a large scale, though. But raids, looting, assassinations, explosions are endless.

So the fourth "arbiter" force surfaced.

The arbiter is much tougher than the mediator, in a word, whoever dares to fight in the nest again, the whole family will be destroyed by labor and management. Violence is suppressed by violence.

The world of survivors suddenly turned into a world of conspiracy and secret warfare. Compared with the legend of the CIA vs. KGB in ancient history, it is a hundred times more exciting and a hundred times more sinister.

In addition to these four major forces, those "explorers" with the lowest status and the least valuable lives, who were forcibly thrown to the surface world to pioneer, also quickly formed their own political parties and guilds.

In this chaotic era of the five factions, the sixth faction then came: the "returners".

The Returnees are manned spacecraft astronauts projected into outer space by humanity who have returned from the sky and brought good news from an extraterrestrial civilization.

The peace mission that the mediators and arbitrators failed to achieve was then carried out without any effort by the returnees.

The strife on the earth suddenly subsided. All eyes are on these returnees.

Of course, such a peace cannot last long. If the returnees do not come up with a reliable rescue plan, the war will be rekindled.

Lin Jiangwen happens to be such a returner.

……