This chapter is purely a science fiction illusion, if you are not very interested in science fiction illusions, you can skip the preface directly and go directly to the second chapter, which does not affect the development of the plot. ）

With the accelerated development of human civilization, the demand for energy is increasing day by day, and the existing energy such as oil and coal are also being depleted, energy has become an increasingly serious problem of globalization, and it is also one of the most important factors restricting human development, and it is urgent to find new energy alternatives.

The combustible ice (natural gas hydrate) buried in the bottom of the deep sea by the carcasses of animals and plants formed over tens of thousands of years has been found in more and more places around the world, and the reserves are extremely large far exceeding coal and oil, coupled with the efficient and clean energy of this energy, so the development and utilization of combustible ice has gradually been promoted to one of the key energy projects developed by various countries, and large-scale cross-international technical cooperation has begun between countries.

Combustible ice is extremely difficult to mine because it is located deep under the seabed and the main component is methane, which is the most destructive gas to ozone.

With the maturity of deep-sea mining combustible ice technology, a large amount of combustible ice has been continuously mined from the seabed and transported to all parts of the world, human science and technology has been advanced by leaps and bounds, and human beings have taken the development and utilization of combustible ice as the fourth industrial revolution.

In just a few years, combustible ice has completely replaced traditional energy sources such as oil and coal, and has begun to enter all aspects of human life.

As everyone knows, this kind of combustible ice, which is called clean energy, has become more and more controversial, because in just a few years of using combustible ice, the earth's atmospheric composition has also begun to find obvious changes, and there is an unknown gas in the atmospheric composition, and the trend is becoming more and more serious.

This gas is not easy to find because it is very small in combustible ice, colorless and odorless, and relatively stable and does not react with other gases such as oxygen, which is an inert gas and harmless to the human body, so it has not received enough attention.

At that time, many interest groups in various countries invested huge sums of money to support the mining of combustible ice, eager to return the funds, and under the influence of their intervention, they did not know whether they intentionally or unintentionally ignored this unknown gas, so that combustible ice could smoothly enter human life and all fields of society.

Although the content of this gas is very small, but with the mining and use of a large number of combustible ice, this gas accumulates more and more, what people do not expect is that when this gas accumulates to a certain density, in the event of thunderstorms, it will react with the nitrogen with the most content in the air under the action of thunder and lightning, and the material after the reaction is actually an unknown gray gas, which is quietly changing the general composition of the earth and the ecological environment.

Scientists have discovered that the power of this substance to change the composition of the atmosphere is very amazing, but for the time being, the specific harm of this substance cannot be discovered, and there is no convenient and effective filtration method, so they can only publish some research articles symbolically.

Although many environmentalists and scientists in various countries have continuously protested and opposed, they have also won the support of many people in many sectors of society, and even some politicians and parliamentarians have participated in and supported them, and with their continuous efforts, the government has also promised to gradually find alternative energy sources.

Combustible ice has become the mainstream energy source of human society, from people's daily cooking, bathing, to the chemical fuel of rocket launches, and even the traveling cars and power generation are inseparable from combustible ice, plus human beings can not find alternative energy sources in a short time and the inertial use of human society, so countries around the world can only use combustible ice while looking for suitable alternative energy, in order to gradually reduce the use of combustible ice.

The widespread use of combustible ice has made the interest groups of early investment make a lot of money, and has also created a lot of tax revenue for various countries, driven the development of many industries, and stimulated the development of the national economy.

These gray gases float to all corners of the earth with the atmospheric circulation, and when these gray gases finally accumulate to a certain extent, these gray fogs begin to gather in some parts of the earth as if they are attracted by something, and these gray fogs continue to accumulate and slowly thicken, and finally form a gray hemispherical area, which is of different sizes and is spread in all corners of the world.