It is a super technical problem to build a concrete shield directly in the existing city, and the design of the existing city is designed and operated according to the current social operation mode and ecological situation, which does not conform to the apocalyptic situation.

The cost of building new cities, i.e., building huge underground cities in the South China Plain, designed to prevent apocalyptic disasters, is certainly lower than building concrete shields and rebuilding existing cities.

And considering the high temperature of hundreds of degrees Celsius on the surface of the earth in the future, this is a surface environment that will make it impossible for humans to live, but on the other hand, isn't this a new "geothermal energy source"?

Geothermal power generation is to convert underground thermal energy into mechanical energy, and then convert mechanical energy into electrical energy, the most important thing in this process is geothermal energy, and general geothermal energy, many of which are less than 100 degrees Celsius of unsaturated underground hot water power generation. After the apocalypse, when the surface temperature rises to hundreds of degrees Celsius, it is easy to heat water into steam to generate electricity, which is almost equivalent to 24 hours of endless clean energy, and nuclear power plants can be used as backup power sources.

So with that in mind, energy is not an issue, but the most important issue is water.

Water is a non-renewable resource, and after the apocalypse, it is difficult for surface water to exist, so underground cities must consider how to recycle water.

For this point, whether it is China, Europe and the United States, they have a lot of experience in the water cycle of the space station, but after all, it is only a space station, which only needs to meet the needs of less than ten astronauts, and the water circulation pressure of millions of people in an underground city is too great, and there is no way to achieve a complete closure.

A group of relevant experts designed a relevant mathematical model, and the supercomputer ran for a day to come to the preliminary conclusion that an underground city that can accommodate millions of people has an upper limit of water circulation, that is, within this upper limit, no matter how much water resources are stored, it will be exhausted before the upper limit time.

This upper limit is 3 years, 7 months and 15 days.

In the case of a reduced number of people, it will take until an underground city with a population of 1,000 people to barely achieve an infinite water cycle.

But such a city of 1,000 people is meaningless.

Yu Ze hadn't paid attention to the results of these meetings, and his attention was attracted by another thing.

It was a situation that broke out from the United States.

Since NASA and NASA ventilated last year, especially after the probability of a dwarf planet falling into the sun rose to 65%, the two sides have held many secret consultations in private.

Then two plans were decided.

The first plan was concealed in the early stage, and the two sides secretly united with some countries to launch an apocalyptic plan to avoid the leakage of news from causing panic around the world.

The second plan is that after the existence of dwarf planets cannot be concealed, public opinion will mislead the public, making the people think that the dwarf planets are "harmless" and will leave the solar system in a safe orbit and will not cause harm to mankind.

However, what I didn't expect was that it was okay here, but there was Lou Zi on the American side.

A NASA technology engineer publicly announced on the Titok and X platforms that NASA has discovered a dwarf planet that has broken into the solar system, and this dwarf planet will hit the sun in the future, thus bringing the end of the world.

Originally, this kind of news should be monitored, and this is the US government's specialty, but I don't know if it's because the US government is too crotch now, or the department coordination is not done well, or the X platform is now Musk's, they didn't dock with Musk, in short, after the news was sent, they processed this information on the X platform half a day later.

Fortunately, the NASA engineer didn't have many fans and didn't attract much attention on the X platform.

What's bad is the decentralized Titok, this video has spread rapidly, attracting a lot of people's attention, and when the U.S. government wants to take this video off the shelves, it can't do it anymore, and I don't know how much it has been spread and how many people have downloaded it.

Ironically, because there are too many "madmen" on the side of the United States who promote the end of the world, the American people have long been surprised by it, even if this person claims to be a NASA engineer, few people believe and care, they just think it is more fun.

Fortunately, there are also smart people in the United States who did not ban the NASA engineer's Titok account, but just controlled the person, took over his account, and posted some life videos, pretending to be joking.

In the final analysis, this Lou Zi is still a small Lou Zi, and it can only be seen that the United States' ability to keep secrets is really not good. In addition to the engineer, someone else took the initiative to leak secrets to a certain congressman, causing the congressman and several congressmen to put pressure on the president to make the relevant information public.

This is the main reason for the explosion of public opinion in Europe and the United States.

The identity of a member of Congress is not the same as that of a NASA engineer who does not know the details, especially since the former has joined several lawmakers to question the president, which obviously has a greater impact than the latter.

The White House's perfunctory answer did not solve the problem, and some astronomy enthusiasts began to try to catch the doubtful dwarf planets, and the United States seems to want to calm down the situation with this "inappropriate" attitude.

But in early March, an Indian official claimed that the White House was in contact with them, and Mr. Morty presided over a closed-door high-level meeting on preserving the flame of Indian civilization.

The question from the US congressman has not yet been resolved, and the news from India has attracted attention on the Internet, and various comments have emerged one after another, but on the whole, most people do not take it seriously, and only think it is a joke. A small number of them took it seriously, and the comments made by the worried ones were too exaggerated.

"We should be prepared that human civilization may be extinct."

"I have taken most of my savings to buy food, I don't want to go without food in times of calamity, may Lord Vishnu bless us."

……

……

Chen Xin thought it was strange, he stopped the motorcycle and saw a group of people standing in the field in the distance, as if they were gesturing something.

This is not the first time.

Since the Spring Festival last month, he has noticed that there are more strangers in the village, which usually has few people.

The strangers were obviously from the city, including people in work uniforms and engineering helmets, intellectuals in suits, and even people with a leadership temperament, and he also saw the village party secretary carefully accompanying him from a distance.

(End of chapter)