Why do you need to build a space city?

Scientists who strongly advocate space colonization believe that the construction and development of space city is by no means an expedient measure, but an inevitable result of the development of human society and a long-term goal? Then, what will be the development prospect of space colonization in the future 100?

This is the biggest concern of millions of well-meaning people? Scientists never believe fortune tellers' stories, and never place their hopes on those blind utopianism. They like to stand on the cornerstone of "now" and predict and answer all questions with a calm and scientific attitude? If they have any talent, it is their instinct. There are many problems on the earth. Some problems, such as population expansion? The earth is short of resources? Environmental pollution? The potential danger of nuclear war, etc. Are all major issues related to the future of mankind? In recent years, futurology has attracted thousands of scientists with its unique charm. They are conducting systematic and in-depth research on the above problems, and have opened up one brand-new research topic after another, among which the most fashionable topic is the "population explosion" on the earth? Why? Because this problem is a serious problem facing our future generations, and it is also one of the important bases for us to describe the future development prospects of the space city today?

In the future, scientists generally believe that besides thermonuclear war, the problem of "population explosion" on the earth is inevitable? This will be the most intractable problem facing the world in the future 100?

Rising population growth rate is the root cause of population explosion? Demographers have paid close attention to the fact that in the history of mankind, the growth of the world population has not been significant in the past few thousand years, but in the last century or two, the speed of population growth has become faster and faster? Professor of the Federal Republic of Germany? Feng? Blanken's research points out that before 1750, it will take about 1000 to double the world population, but in the following 150 years, that is, by 1900, the world population will double again, and the next population doubling will only take 65 years? From 1965 to 2000, the world population doubled again?

At present, there are about 6 billion people on the earth, one quarter of whom live in industrialized countries in the east and west, and three quarters in developing China countries? The annual population growth rate of industrialized countries is about 0.8%, while that of developing countries is as high as 2.2%? If there are no catastrophes and wars in the future, it will increase to more than 8 billion by 2025, and may break through the10 billion mark by 2080, and even 654.38+0.2 billion people will live on the earth? It is worth noting that in making these estimates, demographers are still based on the declining population growth rate.

In the next 100 years, if this happens, can our earth cope with the heavy burden of nearly three times the population of the world today? Don't talk about anything else for the time being. Let's talk about food supply. According to the report of the World Food Organization, in developing countries, 65,438+0 out of every five people are severely malnourished today? It is conceivable that by 2080, how to feed 654.38+0.2 billion people will certainly become more problematic. At present, the average person in the world consumes 360 kilograms of grain every year? According to this standard, to feed 654.38+0.2 billion people, it is necessary to produce 4.3 billion tons of grain every year? According to the per capita consumption level of 480 kilograms of grain in developed countries, the total grain demand of 654.38+0.2 billion people will reach 5.8 billion tons by 2080. Even if the arable land available for grain production in the world can be expanded from 760 million hectares to 654.38+0 billion hectares by 2080, it means that the grain output per hectare will be increased from 654.38+0.5 tons to 4.3 tons and 5.8 tons. Judging from the current level of agricultural science and technology, it is difficult to do this!

As you can imagine, with the rapid growth of population, besides the problem of food, the problem of resource shortage will become more and more serious? Some people think that the distribution problem caused by the shortage of resources may even lead to nuclear war? This may mean that if it is not solved well, human civilization is bound to face serious danger of collapse?

Can we say that only nuclear war is the only way to save the survival of human civilization? Of course not? Trying to strictly control the growth of the world population and finding alternative new resources are also some effective methods? Perhaps it is an important way to solve the problem of population explosion and resource shortage of the earth by developing the cause of space immigration as soon as possible and letting more people of the earth move into space to settle down?

Technically, with the rapid development of space technology, it is not too difficult to build a space city in space? However, in order to fundamentally alleviate the pressure of rapid population growth on the earth, at least half or one third of the people on the earth should be moved to space to settle down by 2080? If one third of the people on earth, that is, 4 billion people go to live in space, then unless 400,000 buildings are built? A space city with a population of 1 0,000? According to the estimation of the current space city designers, each space city with a population of 654.38 million needs at least 654.38 million tons of structural materials? In other words, to build 400,000 space cities, at least 40 billion tons of structural materials are needed. In fact, I'm afraid the raw materials needed will far exceed this figure? Because in order to ensure the economic development and prosperity of each space city, it is necessary to continuously supply all kinds of raw materials needed for the development of industrial and agricultural production? In the early days of space colonization, we mainly relied on moon resources? However, if we want to build a space city of 654.38 million or one million, it is obviously impossible to rely solely on the moon resources?