As early as when he had just defeated the Bluetook civilization and made great technological progress, Li Qingsong had already devoted part of his energy to the earth's ecological restoration project, and he had persisted in it for decades and has not stopped until now.
Although it is only a small part of Li Qingsong's energy, it is still an enormous project on Earth.
Although the Earth did not suffer much from the previous war from beginning to end, the ecological environment on the surface still collapsed due to Li Qingsong's huge industrial construction.
During those years, too much waste gas was emitted into the atmosphere, and too much sewage was discharged into rivers, lakes, seas and soil.
Some radioactive wastes have even left certain places barren of all vegetation, turning them into a dead end for life.
When the war ended, the earth's surface had been destroyed by Li Qingsong, with large tracts of desert appearing, lakes turning into stinking water, and all the fish and shrimp in the rivers dying.
Over the years, Li Qingsong has dismantled and removed a large number of industrial facilities, and then carried out dredging and purification projects on many rivers and lakes, digging out huge amounts of river and lake bottom silt, purifying it and then discharging it into nature.
Li Qingsong also took the initiative to adjust the earth's weather, adopted various methods to restore precipitation, scattered plant seeds in the mountains and forests, cultivated various wild animals through artificial breeding, etc., making every effort to restore the earth's ecology.
Today, Li Qingsong has completed most of the surface work.
But the effect still doesn't seem to be very good.
"Alas, the air pollution was too serious during the previous period."
Li Qingsong sighed softly: "I thought that after the work on the ground and water bodies was completed, the air pollution would gradually decrease with the ecological self-repair process. Unexpectedly, I overestimated the self-repair ability of the earth's ecosystem."
At this moment, the Earth's atmosphere is filled with not only the exhaust gas and toxic substances emitted by Li Qingsong's large-scale industrial activities, but also stray bullets and shells from space. Although they cannot penetrate the atmosphere and hit the surface, they burn themselves in the atmosphere, spreading the heavy metal elements and toxic substances that make up themselves into the atmosphere.
The combination of the two even makes the Earth's atmosphere slightly toxic at this moment.
Such huge pollution cannot be repaired by relying solely on the self-repairing ability of the earth's ecology.
Without repairing the atmosphere, no matter how hard Li Qingsong works on the surface, it will probably be of little use.
This is a very complicated, difficult and troublesome matter. At this moment, restoring the earth's ecology seems to have no meaning for Li Qingsong.
After all, he is about to leave the solar system, and it is hard to say when he will be able to come back.
but……
Li Qingsong still made up his mind without hesitation.
“We must restore the Earth’s ecology! There is no other reason. The Earth is my home, the home of human civilization!
Before, in order to defeat the enemy, I had to destroy the ecology of the earth with my own hands. Now that I have enough industrial capacity, if I don't do it because it's troublesome, let alone whether my compatriots will forgive me after I restore human civilization in the future, I can't forgive myself!
The target of that intelligent disaster is intelligent civilization. If I escape, they will most likely not have any interest in the solar system.
Things like the invasion of the Blueprint civilization are even less likely to happen.
As long as I repair the earth's ecology, there is a high probability that life on earth will be able to live peacefully on earth.
So, do it! "
Having made up his mind, Li Qingsong immediately began to study plans to purify the earth's atmosphere.
There is only one feasible option at present, which is to spray the corresponding chemical substances into the earth's atmosphere, let them combine with toxic and harmful substances in the atmosphere, and then turn into solids and settle down.
In this way, the atmosphere can be purified.
The difference lies only in the choice of chemical substances and the specific means of dispensing.
But after specific simulation, Li Qingsong finally rejected this plan.
The reason is simple. The secondary disasters are difficult to control and the secondary damage to the earth's ecology is so great that the benefits may not outweigh the costs.
This is a problem that Li Qingsong cannot solve with his current technical means.
After replacing hundreds of chemical substances and conceiving hundreds of purification methods, all of which were rejected by the model, Li Qingsong gritted his teeth and made the final decision.
"Since these methods don't work, let's just use the most primitive, crudest, and simplest method!"
What is the simplest air purification solution?
Obviously, use physical or chemical methods to purify it bit by bit.
Collecting air, purifying air, and discharging air is nothing more than this process.
Purifying one cubic meter of air means emitting one cubic meter of air. Purifying little by little, eventually the entire earth's atmosphere will be purified!
The total mass of the Earth's atmosphere is as high as trillion tons.
Li Qingsong's scheduled departure time is about 30 years away.
If the total mass of the atmosphere that needs to be purified is 60%, which is about 309 trillion tons - after all, due to the distribution of the atmosphere, Li Qingsong cannot purify all the atmosphere. After calculation, purifying only about 60% can reduce the toxic and harmful gases in the atmosphere to a certain level, greatly reducing the impact on the earth's ecology.
In 30 years, trillion tons of atmosphere means an average of trillion tons per year, or about million tons per second!
Done!
Faced with this huge number, Li Qingsong did not hesitate and immediately mobilized the corresponding industrial forces to start producing the machinery needed for this purification work, and then transported it to the earth.
Li Qingsong searched for about 10,000 intersection points of air currents - because there are strong winds blowing here all year round, the gas flows extremely fast, so he began to build an extremely large facility here.
This facility is hundreds of meters high, over 200 meters long and wide, and is filled with complex machinery and pipes.
There is a huge hole in the middle of it.
The hole runs through both sides of the entire facility, with a diameter of 60 meters and a cross-sectional area of more than 2,800 square meters.
There are more than 20 huge fans inside it, and the blades of each fan are nearly 30 meters long.
At this moment, driven by the surging electricity from the nuclear fusion reactor, the facility finally began to operate.
The more than 20 huge fans began to rotate at high speed, making a loud and dull buzzing sound.
So, under the blowing of strong winds in nature and the high-speed rotation of the fan, the air rushed in violently.
As they passed through this huge hole, the various purification methods that Li Qingsong had arranged in advance, such as electrostatic adsorption, chemical reaction, film penetration, and laser burning to destroy molecular structure, began to take effect, directly absorbing or destroying toxic and harmful substances in the air and converting them into harmless chemicals.
After completing this series of purification, the air is discharged into the nature from the other end of the cavity.
Endless air began to converge towards this hole, with the speed even approaching 100 meters per second!
According to this speed, the average amount of air processed and purified by this hole is more than 300 tons per second!
Li Qingsong has built more than 10,000 such giant air purification facilities on the earth!
At this moment, with sufficient power supply from many nuclear fusion power plants, more than 10,000 air purification facilities began to operate at full power.
