Thinking about it this way, the matter of Antarctica and the space station suddenly jumped out of my heart.

Zhang Tianyuan asked immediately.

It was later learned that the astronauts on the space station had safely evacuated after the solar storm.

Including the scientific expedition team on Antarctica, they were picked up after order was rebuilt.

The rescue team sent by Tan Mingda even brought back scientific expedition teams from other countries.

So in this time and space, there is no need to worry about Jedi rescue.

Having said that, Zhang Tianyuan already has a general understanding of other countries in this time and space. He smiled and asked Tan Mingda and others:

"Then I will take everyone to receive supplies now."

"In addition to [-] tons of fruit, I also brought [-] tons of grain. Although it is not a lot, it also represents the heart of our Mutual Rescue Society."

"You're welcome..." Tan Mingda got up and put on his protective clothing, and he could tell from his tone that he was very happy now.

Even the old woman who had been staring at Zhang Tianyuan suspiciously smiled.

This mutual rescue meeting may be fake, but the supplies they brought are real.

Thirty thousand tons of grain is indeed not much.

What is rare is the [-] tons of fruit.

Now the only possibility for them to eat fruit is canned fruit.

And the quantity is already extremely small, and it is only issued as a special reward.

The car drove back to the street where the convoy was parked.

Zhang Tianyuan was still asking Tan Mingda on the way to see if there was anything urgently in need of help in their time and space.

"Whether it's medicine or food, Mutual Aid can help you coordinate."

Listening to Zhang Tianyuan's promise, Tan Mingda thought for a while, and carefully gave an unexpected answer: "We have achieved self-sufficiency, and there is no urgent need for supplies."

Zhang Tianyuan smiled, didn't pay attention to the precautions in his words, but took him out of the car, and asked someone to open the cargo door...

Chapter 171 The Possibility of the Sixth Mass Extinction

puff~

The cargo door opened, and cold air rushed in, and the people in protective clothing felt a burst of coolness.

Tan Mingda was facing the door, using his hands to push away the mist from the cargo hold, and immediately saw the stuffed fruits.

Frame after frame is sealed, and some bright colors can still be seen in the holes on the edge.

"Apple here, Sydney over there..."

Holding the manifest in his hand, Wang Lei reported the varieties to everyone. They were basically apples and pears that could last for a long time. In addition, there were also a small amount of bananas, plums, peaches, etc. that Huantai Spacetime purchased on the spot.

Seeing the carts of fruits with their own eyes, Tan Mingda and the others all had smiles on their faces, their eyes seemed to recall the past.

The other people who came with Tan Mingda stared straight at the car.

No one spoke, but their emotions were expressed in their eyes.

It's a longing.

Seeing their reactions, Zhang Tianyuan knew that this meeting was the right choice.

These fruits and food are not expensive, but they are exactly what this time and space urgently needs.

"OK OK……"

"Close the car door, don't get sunburned."

Seeing the water dripping from the surface of the fruits in the car to the ground in the hot and dry environment, Tan Mingda, heartbroken, stopped this meaningless exhibition with a voice.

Then he turned around and asked someone to arrange the warehouse and seal up all the fruits.

The convoy of Wandering Time and Space also moved according to the arrangement and drove towards the various warehouses.

Zhang Tianyuan obviously felt that as the fruits and grains entered the warehouse, the trust of Tan Mingda and others in him had increased a lot.

They even got back in the car and took the initiative to learn about the Mutual Rescue Society.

"If we choose to join, can you really meet the standards stated in this application?"

Tan Mingda held a membership application form in his skinny hand.

As for the question, it is natural that the Mutual Aid Society will not interfere in their internal affairs.

Zhang Tianyuan smiled and understood his worry.

After all, now that Tan Mingda and the others have actually achieved the position of world hegemony, they can even send people abroad to mine resources and carry out rescue operations.

As long as they follow this trend, sooner or later the whole world will be Tan Mingda's sphere of influence.

America, which was left alone, could not escape in the end.

Originally, this future was visible to the naked eye.

As a result, a Mutual Rescue Society suddenly popped up now, which is undoubtedly a huge change.

Zhang Tianyuan pointed to the application form and said: "I can only say that so far, the Mutual Rescue Association has gone through four time and space, and has not violated any terms of the agreement to any member state."

"If Mr. Tan really wants to prove it, he can wait until later to learn more about it from other time and space."

"It seems that President Zhang is very confident..." Tan Mingda closed his eyes lightly, as if he was seriously considering whether to join the Mutual Rescue Society.

The old woman next to him was also silent.

It's just that Zhang Tianyuan feels that what these two people are thinking about now is probably the truth of the Mutual Rescue Society.

Suddenly, he remembered something.

"Mr. Tan, do you know that this time and space of yours has actually begun to recover?"

"recover?"

The silence was suddenly broken.

Tan Mingda and the old woman's eyes suddenly focused on Zhang Tianyuan's young face.

"Yes, your earth may have entered the recovery period now, and some places can now allow people to live normally."

"Where is it?" The old woman couldn't help but make a sound.

Zhang Tianyuan thought for a while: "San Francisco, there should be a large area of ​​land there that has returned to a relatively normal temperature and radiation value, at least allowing people to move normally in a short period of time."

At the end of the movie, the protagonist is going west from the central part, 18 hours away from the Golden Gate Bridge, and has the last sun.

And there, the temperature has returned to normal.

After driving all the way to the Golden Gate Bridge, the vegetation along the way began to recover, and the green reoccupied both sides of the road.

It can be seen that the land area restored to normal is not small.

……

Considering that the two of them would definitely want to ask him how he knew it, Zhang Tianyuan spread his hands and said, "You don't need to ask me how I know it."

Tan Mingda was calmer, and he changed the question: "Does the president know other areas that have returned to normal?"

"I don't know." Zhang Tianyuan answered very simply.

Tan Mingda and the old woman beside him looked at each other, and the long-standing tacit understanding allowed them to communicate only with their eyes.

No need to say anything, the old lady already knew what he meant, she took the initiative to say: "I will arrange a satellite reconnaissance mission later, and I will ask the aerospace department to launch a few more satellites later, our concern for North America is indeed not enough."

Tan Mingda nodded, looked back at Zhang Tianyuan, and expressed his thanks to him.

For this news, they would rather kill the wrong than let it go.

However, Zhang Tianyuan suddenly spoke again: "Although it's a bit cold water, I don't think this is necessarily good news, because there are several other possibilities for the situation in San Francisco..."

The old woman looked over in astonishment: "What does Chairman Zhang mean?"

"Aiming at the phenomenon of temperature recovery in San Francisco, in fact, before we arrived in your time and space, our Mutual Rescue Association once held a seminar with meteorological experts from various time and space."

When Tan Mingda heard this, his heart tightened: "How's the result of the seminar?"

"The situation is both good and bad." Zhang Tianyuan took out a document, which recorded the results of those seminars:

"Because the thickness of the ozone layer is different in different regions. So the best result is that the thickness of the ozone layer in the San Francisco area may be thicker, blocking more ultraviolet rays, and at the same time, due to monsoons or ocean currents, it can maintain a more comfortable temperature. ..."

Wang Lei was in charge of handing the two identical documents to Tan Mingda and the old woman, his face was very solemn.

He was recruited into this task before that seminar, so he watched the whole seminar process and knew the result.

Tan Mingda rubbed the paper in his hand, but suddenly he didn't dare to open it.

He glanced at the old comrade-in-arms next to him, who was also staring at the cover of the document in a daze.

In the end, the skinny old man sighed, and said directly: "President Zhang, please."

Zhang Tianyuan's expression was a bit more dignified than Wang Lei's.

"The other result is a bit more complicated."

"The ozone layer that everyone knows is actually the oxygen molecules in the atmosphere that are decomposed into atomic states after being irradiated by high-altitude short-wave ultraviolet rays.

These oxygen atoms then react with oxygen molecules to form ozone, which falls to the bottom of the ozone layer due to its specific gravity.Finally, it is affected by the rising ambient temperature after falling and the irradiation of long-wave ultraviolet rays, and it is reduced to oxygen again... This dynamic equilibrium process constitutes the ozone layer as we know it. "

To put it bluntly, oxygen is synthesized into ozone at the top of the ozone layer, then falls below, and is reduced to oxygen again, and then this process is continuously cycled to form the ozone layer.

Both Tan Mingda and the old woman nodded, expressing that although they were old, they could still understand.

Zhang Tianyuan opened a page of the document, pointed to the content on it, and described the process of solar storms destroying the Earth's ozone layer.

This process is simpler.

After a solar flare erupts, the ejected high-energy protons ionize nitrogen and oxygen molecules in the atmosphere and form nitrogen oxides.

These nitrogen oxides formed in large quantities continue to chemically react with ozone, reducing it to oxygen molecules and oxygen atoms.

Moreover, after a solar flare erupts, the intensity of ultraviolet radiation output will also increase.

After these radiations are absorbed by the earth's atmosphere, the atmosphere will be heated, which will lead to an increase in the temperature and density of the atmosphere, and the ozone will be naturally decomposed in large quantities...

"Generally speaking, the destruction of the Earth's ozone layer caused by these two methods can be recovered within a few years as long as the scale is small."

When Zhang Tianyuan said this, he paused.

Then Tan Mingda took the initiative to say: "The solar storm 15 years ago was an exception. Our ozone layer was melted almost in a day."

"Yes," Zhang Tianyuan nodded, and he rubbed his brows: "The intensity of the solar storm you have experienced is unprecedented, and this is what we are most worried about."

"That is, is it possible that the solar storm not only destroyed your ozone layer?"

Hearing this sentence, the old woman seemed to have been shocked and squeezed her scarred hands tightly.

Tan Mingda also thought of something.

"I have seen a report before, which also has a similar presumption, saying that the solar storm may have caused the destruction of the earth's air molecules..."

"Well." Zhang Tianyuan continued: "In the research of other time and space, there is a view that the first mass extinction of life 4.4 million years ago was caused by a supernova explosion."

"The gamma-ray burst that resulted from that outburst hit the Earth directly, destroying the ozone layer within 10 seconds and simultaneously destroying the molecular structure of most of the air in the atmosphere."

"In the decades after the ray burst, the air molecules in the atmosphere recombine to form a large amount of nitrogen dioxide, which blocks ultraviolet rays but also blocks a lot of sunlight..."

Speaking of this, Tan Mingda's eyebrows twitched unconsciously, which already showed his mood at the moment.

He interrupted: "Our time and space have similar inferences."

Zhang Tianyuan looked up at him, and understood that this time and space also realized the danger.

"After the sun was blocked at that time, the earth ushered in a permanent ice age. About 10% of the sea water was frozen, and the sea level dropped by about 100 meters."

"This disaster lasted for about 40 years, when 85% of the species on the earth went extinct..."

"Is President Zhang worried that our time and space will be the same as that mass extinction?"

"This time and space is indeed likely to end in such a way."

Zhang Tianyuan lowered his eyes, and his tone contained a sigh.

After several times and spaces, he has long known that the world of movies is not exactly equal to movies.

Although what is given in the movie seems to be an ending where nature recovers and mankind regains hope.

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