Chapter 68

The drizzle has been falling, neither getting bigger nor stopping.

Although the protective clothing has a good effect of keeping warm, Chen Xin still feels a bit cool.

"Hoo Hoo... " Chen Xin's panting is a little rough. Although the protective mask can effectively block the harmful ingredients in the air, it also affects breathing.

It was OK before, but now with Chen Xin's breathing quickening after a long walk, he feels a little out of breath.

Chen Xin wanted to find a place to sit down and take a rest, but seeing the rain and mud all over the ground, he decided to move on.

After all, it's just a little bit short of breath. Chen Xin had a similar experience when he traveled to Sichuan before. Just slow down a little.

However, this also made Chen Xin doubt whether he really lacked exercise as Qin Lan said. When he went to Sichuan for tourism, he was panting because of the altitude reaction caused by the local high altitude and thin air.

Is it true that when a professional network writer is not exercising these years, his physique has become worse?

Chen Xin has such doubts. He can't help wondering if he should get a human powered generator to put in the shelter. Stepping on the human powered generator when he's free can not only generate energy, but also exercise.

But just as Chen Xin was thinking about it, he suddenly stopped and looked up at the sky.

The rain fell on the screen of the protective mask, leaving an ugly stain, but Chen Xin was still staring at the sky, looking at the thick dust clouds in the dark sky.

"Damn it! It's hypoxia! " Chen Xin's brain is not stupid, he just subconsciously ignored this problem.

Who cares about the oxygen we breathe all the time? I'm afraid it's only when you're really out of breath that you realize you need oxygen, right?

When preparing for the construction of the shelter before the disaster, Chen Xin also subconsciously ignored this problem, just prepared oxygen cylinders in the shelter.

But now, when he realized that he had encountered the problem of lack of oxygen, he realized that when the plants on the surface were destroyed by the fire and the sky lost its sunlight, the air we used to take for granted had become the biggest problem for survival.

People need oxygen to live, any activity of the human body also needs oxygen to maintain, and the more intense the activity, the more oxygen consumption.

Without natural plants for photosynthesis, oxygen in the atmosphere will gradually decrease with the consumption of surviving human beings.

Unless the dust clouds in the sky disperse, the sun shines on the earth again, and new plants germinate for photosynthesis, otherwise, the process will be irreversible.

If the surviving human wants to survive, they can only find a way to produce new oxygen.

Chen Xin himself is not worried about this problem. There is a greenhouse in his refuge. Under the light simulated by the fill light lamp, all the crops will still carry out photosynthesis, which is enough to maintain his oxygen consumption at present.

As for the official refuge, Chen Xin thinks that the state should take this problem into consideration. The only uncertainty is whether the state can solve this problem perfectly.

After all, the state should consider all the survivors in the country, not one of the refuges.

Common oxygen preparation methods include physical oxygen production and chemical oxygen production. Physical oxygen production is simply to collect oxygen in the air to use where oxygen is needed. Chemical oxygen production is to reduce oxygen from carbon dioxide or other raw materials containing oxygen to form new oxygen through chemical reaction.

These two methods were widely used in oxygen production before the disaster, but in the present end, they are not so applicable.

Physical oxygen production needs a lot of electricity, and only the original oxygen in the air is extracted. In the present environment where the oxygen content in the atmosphere is gradually decreasing, this method is not applicable.

As for chemical oxygen production, although it has no disadvantages of physical oxygen production, it also has disadvantages, that is, chemical oxygen production needs to consume chemical agents, and the cost is high, so it is not suitable for large-scale application.

Therefore, if the government wants to solve this problem, it can only take measures other than these two means to solve it.

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"the task has been finished at last!"

After completing the escort work of oxygen equipment, the SWAT team returned to the shelter under the police station, and everyone relaxed.

Although most of the special police officers did not know what the materials they were escorting were, they could guess that they were very important materials when they saw the armored train at the railway station and the situation of the escorting.

So when escorting these materials, everyone was very nervous.

Now that we have finally completed the task, we are naturally relieved.

The group walked to the area where the SWAT team was. Although the task was not tiring, everyone was a little hungry under high mental tension.Although the food in the shelter is not very good, it is a happy fact to have something to eat after the mission.

But now the food in the shelter is mainly emergency food reserved before the disaster, so although there is a canteen, it is only used to distribute ration food, and there is no fire for cooking.

After all, fuel is precious now, so it's a bit luxurious to cook.

As for the greenhouses that have begun to produce mushrooms, and the artificially raised mice and bread worms, although these foods have gradually begun to appear in the recipes of the shelters, they are not so far as the Swat members can only eat them.

"What do you have to eat today?" A special police officer hooked his friend's shoulder and listened to him.

"I think it's fried mutton with scallion. Yesterday's is shredded pork with Beijing sauce. It's time to change today."

The companion responded to his words. It sounds like the food is OK, but in fact, what they said was only the taste of self heating food.

In the two months after the disaster, except for mushroom and mouse meat, we haven't seen fresh food for a long time.

On one side, another member of the special police broke in and said, "I think there should be cabbage soup today. Yesterday we came back with a box of cabbage! A whole box of fresh cabbage

"No! It's me and the pillar who carry it together. It's two hundred jin! " When a special police member who also went to carry vegetables yesterday talked about the cabbages, his eyes were already bright.

Not everyone knows about the news of fresh vegetables. When they learned about it, many SWAT members cheered excitedly: "Oh! I haven't smelled cabbage for two months! "

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