Although she was a little confused by Chen Xin's question, Mo Qingyan still answered his question: "Plants? Photosynthesis? I have a green box in my bedroom, why do you suddenly ask this? ”

"The sky is obscured by clouds of dust and there is no sunlight, what do plants rely on for photosynthesis? Without photosynthesis, where does the oxygen in the atmosphere come from? Chen Xin's voice was very flat, just telling a fact, but it made Mo Qingyan feel a burst of shock: "Although 70% of the oxygen in the atmosphere comes from marine ecosystems, even algae need sunlight to produce oxygen, and now there is no sunlight." ”

"Do you mean that there will be no oxygen in the atmosphere?" Mo Qingyan asked Chen Xin with a little panic.

Although Mo Qingyan couldn't see it, Chen Xin still nodded: "If the conversion of carbon dioxide from ecosystem photosynthesis is lost, the concentration of carbon dioxide in the atmosphere will soon increase, and the oxygen content will continue to decrease." In addition, when the oxygen content in the atmosphere is less than 10%, human beings should suffocate to death. ”

"Ahh So what do we do? Mo Qingyan hurriedly asked Chen Xin for help, and her tone couldn't help but be full of panic.

In the face of such a planetary catastrophe or environmental catastrophe, there is no possibility that the power of the individual will make any changes, after all, this book is just a slightly unserious science fiction novel, not a fantasy novel that is strange and chaotic, and does not even talk about the basic laws of physics.

"Planting grass is the solution to the problem." Chen Xin said half jokingly and half seriously, and then explained: "Since you have a green plant box, this problem is actually not difficult to solve, the oxygen required for normal breathing of an adult needs about 10,000 leaves of average size for photosynthesis, and if you calculate a tomato with 250 leaves, you need about 40 tomatoes, covering an area of about 50 square meters." ”

Speaking of this, Chen Xin smiled, it was the first time he saw Mo Qingyan's panicked appearance, and only after laughing did he continue: "So as long as you build a large enough planting greenhouse in the basement of your house, it is enough to ensure the oxygen you need in your daily life, and it can also provide you with enough vegetables and food." ”

"Ahh So that's it! So it's no wonder that the last time A-Ning and I went to your place, we didn't think you were bored at all! It turns out that it's not that the ventilation is good, it's that you have plants there that are producing oxygen! When Mo Qingyan heard Chen Xin say this, she finally reacted.

At the same time, Mo Qingyan, who reacted to this incident, also realized that she felt that the air in the bedroom was good during this time not because of the good ventilation in the bedroom, but because of the green plant box in the bedroom where she had been turning on the fill light.

It's just that this situation made Mo Qingyan have new worries, and she asked Chen Xin, "Ah Xin, what about the shelter?" There are tens of thousands of people living in government shelters, and if there is no oxygen, wouldn't they all die? ”

"You can think of this problem, do you think the country can't think of it? The government should have a plan for dealing with it. Chen Xin is not worried about this, he does not think that the country will ignore this issue like himself.

If so many experts and scholars in the country can't come up with a disaster response plan that can at least deal with most of the problems when the disaster is warned three months in advance, then this group of people is definitely on a corpse diet.

Hearing Chen Xin say this, Mo Qingyan also found that she was worried, if this kind of catastrophic country involving everyone had no way, she couldn't do anything alone.

However, Mo Qingyan still asked Chen Xin: "The government's refuge is all over the country, but what about private refuge like ours?" Ah Xin, you have a planting greenhouse there is not a big problem, what should I do? No, I really want to take A-Ning and Qingxin to you, right? ”

"It's not very difficult to solve this matter, if I had realized this problem in advance, a few fill lights and a few water tanks would have been able to solve the problem before the disaster, but now ......" Chen Xin hesitated for a moment, but still said to Mo Qingyan: "You can try to get a large water tank to raise algae, the metabolism of algae is very fast, and under the condition of ensuring light, oxygen can be released quickly, which is more efficient than plants."

It's just that this will consume a lot of water and electricity to provide light, but the city government is still supplying water and electricity, and it is still okay to ensure the survival needs of the three of you. ”

"Raising algae? How do you get this? When Mo Qingyan heard Chen Xin say this, she also let go of her worries, and instead asked how to raise algae.

"Use a grille plate to keep the surface moist, and then use a fill light to continuously irradiate it." While talking to Mo Qingyan, Chen Xin turned on the computer and searched for the information inside.

Chen Xin remembers that when he was writing a book before, he found a document about the German Ecological Experimental Building, which introduced that the Germans used algae to make the biological façade of the building, cultivated biomass through photosynthesis for biogas reaction, and then generated carbon dioxide through biogas power generation for the biological façade to be recycled.

The main factor in the establishment of this cycle is that sunlight induces algae to photosynthesize and multiply, which can only be compensated for by the lack of sunlight now.

However, in this way, biogas power generation from biomass produced by algae is definitely not enough for the light consumption, and additional energy consumption is required.

Fortunately, Mo Qingyan did not cut off water and electricity, as long as the supply of water and electricity was guaranteed, if she came up with such a set of equipment, she could still ensure the survival needs of her, Mo Qingxin and Ding Ning.

Chen Xin explained to Mo Qingyan in detail the principle of the whole system and how to make it, and Mo Qingyan also recorded what Chen Xin said, and planned to build a set of such equipment in his shelter to produce biological oxygen when he turned around.

"Thank you, Ah Xin! If you hadn't reminded me, I'd have been suffocating to death before I realized this. Mo Qingyan thanked Chen Xin, and did not forget to say in addition to thanking: "Aren't you worried about my wine?" I'll give you another box of gold rum when I go back, even if I exchange these materials with you. ”

Hearing Mo Qingyan say this, Chen Xin couldn't help but feel a little surprised: "Is it necessary to be so clear with me?" ”

"People say that brothers still settle accounts, even if we are brothers, it's better to be clear." Although Mo Qingyan said this with a smile, she was extremely serious: "Although you don't mind Ah Xin, you don't mind me taking advantage of you, but now in this last world, everyone still has to be clear, so as not to cause contradictions." ”

Hearing Mo Qingyan say this, Chen Xin didn't raise any objections, but just chatted with her again about whether to tell the people in the survival group before saying to her: "By the way, Long Niang, you can help me talk to Ah Lan, just say that I found survivors in a supermarket in the direction of the high-speed rail station......"