In fact, Mo Qingyan also knows how important it is to have a greenhouse that can produce food in the end of the world. However, the shelter of her family was built when the house was built. At that time, she did not consider the greenhouse. Instead, she designed the basement as a bar.

    As a result, Mo Qingyan''s shelter has no self-supporting ability in food.

    In the short term, of course, this is not a problem. Whether it''s exchanging goods with others or getting food in other ways, it can be sustained.

    Even because there is enough underground space, Mo Qingyan has a lot of materials in reserve, enough for her, Mo Qingxin and Ding Ning to eat for two years.

    If it''s just a nuclear war or other doomsday disaster, one or two years is enough time for them to wait for reconstruction or rescue teams.

    But now we have to face a century long cold night. The earth''s surface will be frozen for 100 years, which is not suitable for any crops. Almost 99% of human food production has been completely wiped out.

    In this case, all one can count on is the reserves of supplies before the disaster, and the underground, less temperature affected greenhouses built in shelters.

    Chen Xin may not know the situation because she is far away from the city, but Mo Qingyan knows something about the situation because she is close to the city''s Government shelters and shopping center shelters. Now the shelters in the city have begun to control the use of materials.

    Although the main source of food is the pre disaster grain reserves, it has also begun to match the food with the mushroom produced in the greenhouse and the mice raised.

    In Yanguo, mushroom cultivation technology has been quite mature, which is why the government chose mushrooms as the main food source for post disaster shelters.

    Mushroom is the main food source available in the current environment. If the management is reasonable and the planting area of 100 square meters adopts three-dimensional cultivation with five layers, the yield of even the most conservative output of 30 jin per square meter can reach 75000 Jin per year.

    The yield is not low, but if they want to ensure the food supply of a shelter, although it is difficult to build a greenhouse in a small shelter, they don''t need too much planting area to ensure the food supply.

    It''s like Chen Xin''s shelter, a 100 square meter greenhouse for planting mushrooms. If all kinds of mushrooms are used, Chen Xin will be able to eat enough to survive. There is still surplus production to be used to make mushroom wine and drown himself.

    But for the big shelter, the problem is more serious, and the bigger the shelter, the more serious the problem.

    Because the more people there are, the more food they need, and the larger the greenhouse area they need.

    After all, at first glance, one hundred square meters can produce more than 70000 Jin of food a year. However, the city has a resident population of 300000. Thanks to the policy of "not abandoning one person" of the government before the disaster, at least 90% of the people have been able to enter the refuge and survived.

    According to one ton of food consumed by one person a year, 270000 people need at least 360000 square meters of mushroom planting area to meet the consumption.

    Because no crops can be planted on the surface, all the food sources are underground greenhouses, but there is obviously no such large space for planting greenhouses in the shelter.

    And 360000 square meters is 3600 mu, 540 Mu and 36 hectares, which is equivalent to half of the Forbidden City, 1.7 bird''s nests and 51.4 standard football fields.

    Such a large area, if it is before the disaster, of course, is nothing, not counting the area of rural cultivated land, just the labor reform farms near the city have 36500 mu of cultivated land, food output is not a problem at all.

    As for those who want to build greenhouses, if they want to build them on the surface before the disaster, such a large area of greenhouses is nothing more than a matter of money, and there will be no construction difficulties.

    But at the end of the disaster, because of the severe cold, it is impossible to build a greenhouse on the surface. If we want to ensure enough food output, we can only dig out enough space underground.

    It takes a long time to dig out such a large area of underground space.

    Even if all the major shelters have enough manpower, they may have enough tools in reserve before the disaster. It is a very big project to dig out such a large space.

    In other words, in the future, if there are no other factors, food shortage will be an inevitable problem for the major refuges.

    Fortunately, the end of the world has just begun, and the major refuges have sufficient material reserves, which can last for a long time.

    This period of time is a golden time for all shelters. Whether they can cope with the food crisis depends on whether they can dig up enough greenhouses during this period of time.

    Therefore, it can be predicted that in the future, food will become the most urgent demand, and ensuring a stable food supply will become the top priority to survive in this end of life.

    Whether it''s Chen Xin or Mo Qingyan, or people in other shelters, if they want to survive in this last world, they must first solve this problem.Fortunately for Chen Xin, with systematic help, food is no longer a problem for him.

    "Well, with Alain''s help, the problem of long Niang is solved." Chen Xin looked at Mo Qingyan and said to her with a smile in his voice, "then you just need to empty the wine cellar and transform it into a greenhouse."

    "Well, if I empty the wine cellar, you can think about my collection, right? I tell you, if you want my wine, you can exchange it for something good! " Mo Qingyan snorts at Chen Xin.

    Looking at Mo Qingyan''s picture, Chen Xin immediately smiles: "don''t worry, I''m sure I won''t let you down!"

    Qin LAN just watched the quarrel between Chen Xin and Mo Qingyan. When they finished talking, she said, "if you''ve finished talking, is it time to get the dishes you promised to our SWAT team?"

    Although Chen Xin exchanges materials with Uncle Ding in the name of Mo Qingyan, both uncle Ding and Chen Xin understand that the two sides of the transaction are Chen Xin himself and the special police team.

    After all, although uncle Ding is the captain of the special police team, he can''t get so many materials himself, and he can''t take so many vegetables to eat alone. Therefore, it''s inevitable to collect materials in the name of the special police team and exchange vegetables to improve the food for the special police team.

    So it''s not a problem for Qin LAN to say that.

    In the face of Qin Lan''s urging, Chen Xin smiles and takes them to his greenhouse: "don''t worry, the dishes are ripe. I was harvesting before you came."

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