After a cursory glance at political textbooks and history textbooks, Pang Xuelin had a preliminary understanding of this era.

At present, mankind has completed the construction of the circum-equatorial steering engine, and the construction of the propulsion engine is also in the final stage.

There are 12,000 dungeons around the world, all built under 12,000 planetary engines.

Each dungeon has its own industrial, agricultural, water, and atmospheric systems, and the energy system relies on a refusion planetary engine.

After 30 years of population control, the total global population has dropped from 7 billion at its peak to about 5 billion, with 12,000 dungeons, basically meeting the needs of all people on the planet.

The reason why there is a lottery to enter the dungeon is because the construction of the dungeon is still in the final stage, and the operation of various systems is still being tested, so the surface humans can only be evacuated into the underground in batches.

Due to the earth's rotation and braking, the equatorial steering engine is turned on at full power, resulting in abnormal climates and frequent disasters around the world, and the living environment on the surface is becoming more and more harsh.

It takes two to three years to retreat into the dungeon, so who enters the dungeon first and who enters the dungeon later becomes a political option that can be operated.

What's more, the large-scale migration of people from countries in the southern hemisphere to the northern hemisphere, whether the right to draw lots between immigrants and nationals is equal has also become a big problem.

In North America, it is said that relations between Latinos who immigrated from South America and whites and blacks are highly strained.

And in the past three decades, the glaciers of the Arctic and Antarctic have melted by nearly one-third, and the global sea level has risen by nearly 20 meters.

Fortunately, China, with its strong infrastructure capabilities, has built a large number of dams in coastal areas to stop the backflow of seawater.

Some countries that do not have the capacity to build dams, but are close to the sea, have to relocate their entire populations, and there are countless tragedies during this period.

It took two classes for Pang Xuelin to read the history textbook and the political textbook, and he had a rough understanding of the modern history of the Wandering Earth plane, and as for the details, he could only understand it slowly later.

When the bell rang for the end of the second period, Pang Xuelin got up and went to the bathroom, and then while walking, he thought about how to go in the future.

In this world, it is certainly no longer possible to follow the rules of the real world.

Not to mention, at the time of life and death, human leadership obviously attaches more importance to research in the field of application, and even if it solves the BSD conjecture and completes the Ponzi geometry, I am afraid that the effect is quite limited.

An ordinary university teacher, or researcher, in this darkest age, can only go with the flow like an ordinary person at best.

What's more, I still have relatives to protect.

Although Pang Xuelin knew that this world was only one of the stops on his sci-fi plane adventures, he couldn't watch his relatives suffer various accidents in the midst of possible disasters.

If you want to be better protected, you have to show your worth!

Pang Xuelin's eyes narrowed slightly, perhaps the two black technologies of flying blade materials and graphene aerogel metamaterials will become the capital for his survival in this world.

……

As soon as Pang Xuelin walked to the door of the classroom, he heard a commotion coming from inside!

"If you hit the Earth Faction, the cowards of the Earth Faction will only shrink to the Earth and wait for death!"

"The fool of the spaceship faction, if you have the ability to build your own spaceship, what kind of ability is it if you can't beat your own people!"

"You give us resources, building planetary engines wastes enough resources to build a spaceship to send us all away!"

"You want to be beautiful, you spaceship faction just want to seize power!"

"Down with the Earth Pie!"

"Down with the Spaceship Pie!"

……

Soon, the quarrel developed into a brawl, and it was not until the head teacher Yang Zhihe appeared on the scene with a gloomy face that the brawl was terminated.

Lin Chendong got up from the ground after being beaten and his nose was blue and his face was swollen, still looking unruly.

"Lin Chendong, don't be unconvinced, you kid, I'm also an Earth faction, do you even want to fight me?"

"The Earth faction is all fools!"

Lin Chendong said with a stiff neck.

Yang Zhihe said: "Okay, good, the earth faction is all fools, as far as you Lin Chendong is smart, then let me ask you, the largest spaceship we can make now is the size of a city, without such a majestic ecosystem as the earth, the ecosystem on the spaceship will collapse in a few decades, what will we do then!" We are now using planetary engines to propel the earth to change orbit and accelerate, as long as we get out of the range of the sun's helium flash, all mankind will be saved! ”

"It's too late, the solar helium flash will explode in ten years, and if we want to get out of the helium flash range, we must let the earth continue to accelerate its rotation around the sun until the aphelion point is close to Jupiter, so that we can get out of the solar helium flash range with the help of Jupiter's gravitational slingshot effect, which will take at least ten years or more, and we don't have that much time! When the sun's helium flash erupts, everyone, including the Earth, will be vaporized! ”

"Where did you hear this rumor, it's illegal to spread this kind of rumor, you immediately give me to stand in the corridor, don't come in this class!"

"Hmph, just stand!"

Lin Chendong was not afraid, and came out of the corridor with his head held high.

The whole class seemed to be surprised by this scene, and even Yang Zhihe just shook his head and did not do anything further.

Pang Xuelin frowned and watched coldly.

He had some headaches.

Whether it's in textbooks or the scenes observed along the way today, the world should be based on movies.

But the struggle between the spaceship faction and the earth faction is a plot that appears in the novel and is not mentioned in the movie.

Pang Xuelin suspects that in this plane, it is very likely that fiction and film have converged.

If this is the case, then you will have to face more uncertainties.

In the novel, humanity's crisis comes from the influx of magma in the dungeon, from the asteroid impact when the Earth passes through the asteroid belt, from the tsunami, from the earthquake, from all kinds of natural disasters, large and small.

However, the greatest enemy of mankind comes from the human heart!

In the second half of the novel, humanity has gone through a lot of hardships to finally free the earth from the range of the sun's helium flash.

However, fueled by various civil science, careerists, and rumors, mankind believes that the United Government of the Earth has told a big lie to all mankind, and that the sun will not have a helium flash at all.

As a result, a global insurgency broke out, the government forces retreated, and the coalition government finally failed, and finally 5,000 people loyal to the coalition government were driven to the ice field by the rebels, unloading the batteries and letting them slowly freeze to death.

However, just after the execution was completed, a helium flash erupted, and humanity paid a heavy price for its mass dementia.

Pang Xuelin didn't know if there would be a rebellion in this plane.

If it is really as shown in the novel, then it is a question whether he will survive the rebellion in the end.