Just one accidental morning exercise made Zhao Bing feel a sense of crisis, which is definitely hard to believe. The reason why he thought this was due to the debate on the Internet in his previous life. When discussing the rise and fall of the dynasty, some thought it was the progress of science and technology, some said it was a social system, some said it was war and famine, but some also put forward the view that climate and environmental changes affect the historical process.

The result of the debate was that no one could convince anyone. The post gradually fell silent and ended, but it really left an impression in Zhao Bing's heart. Everyone understands that even in modern society, the most direct appearance of a major natural disaster is a poor harvest, an economic recession, and thus triggering a humanitarian disaster.

However, in the context of global cooperation in modern society, big countries can generally digest themselves, while small, poor and isolated countries will still cause political turmoil. Zhao Bing, who was an ordinary person in his previous life, felt that it would lead to shortages of certain commodities, which would in turn raise prices; or the number of bad and extreme weather increased, which would increase the time for the shipyard where he worked for increased work and avoid risks and reduced income.

But when he came to this world, Zhao Bing's butt sat on Mount Everest, and his perspective on the world was naturally different. He realized that in a modern society where communications, production, transportation was highly developed and products were highly developed, people could obtain information in a timely manner and dispatch materials through a fast transportation system, which would still have an impact on the lives of ordinary people.

In ancient times, traffic was backward and information transmission was slow. Once a disaster occurred in a remote area, the supreme ruler was often too late to learn about it. Even if materials and personnel can be dispatched in time to rescue disasters, it was often more than a month later. At that time, the disaster must have formed and the consequences were even more serious. Once the situation was out of control, it would spread further, leading to the destruction of a dynasty.

Of course, Zhao Bing also knows that there are many reasons that affect the historical process, and climate is just one of them. But it cannot be ignored. The natural environment is the earth space on which humans rely on. Every major change in time and space of the environment has a huge impact on human society.

The contradiction between ethnic invasion in ancient Chinese history mainly comes from the northern desert. Because ancient China was a continental country with oceans on the east and south sides, it was basically an obstacle for humans to explore the world. There were tall Qinghai-Tibet Plateau and vast deserts on the west side. Foreign ethnic groups were unable to cause a thousand-mile raid on the Han regime in the east due to terrain and climate. Therefore, the Han regime was always under pressure from the north in ancient times.

Because the ethnic minority areas in the north are nomadic economies, they rely entirely on grasslands to support themselves. When the climate becomes colder, the grasslands grow poorly and cannot obtain sufficient food supply. At this time, they will launch an attack on the Han regime in the south to obtain food. The ancient Central Plains regime was always a country in agriculture, and the south also became colder at this time, causing insufficient land accumulation, damaged crop growth, and significantly reduced production of grain and other materials. Severe famine will inevitably cause unrest, which will affect the politics, military, and economy of various dynasties, and thus the overall national strength will decline.

Therefore, from the perspective of temperature, if the climate in that period warms and is basically stable, and the scope of the farming dynasty has basically not changed significantly during the same period, then the strength of the dynasty will be slightly enhanced and history will enter a rare period of stability. When the climate becomes cold, the combat effectiveness of nomadic civilizations will be strengthened, and the harassment of nomadic peoples will be more frequent, and the Central Plains dynasty will also face the dilemma of internal and external troubles. During this period, the dynasty changed rapidly, which means that it entered the cold period.

The research results show that a strong central government was generally established during the warm period, and the land area was large at this time. During the cold period, the strength of the Han regime was greatly reduced, and the ethnic minorities in the border areas were "prosperous", and the pressure from foreign races was very high. Zhao Bing's warmth after entering the Song Dynasty was lower than that of the Sui and Tang dynasties, and the temperature in the north once again dropped, entering the third cold period in Chinese history.

Fortunately, the cold was not long, but it was still fatal for the Song Dynasty. The ethnic minority regime also pursued good pastures. The Khitan, Dangxiang, Jurchens, and Mongolia went south to beat the Song Dynasty one after another. Therefore, although the Song Dynasty had a high economic development, its military and ruling scope was no longer as good as the previous dynasty, so it was driven from the Central Plains to Jiangnan, survived and gained a bad reputation as a "weak Song".

During the period when the Song Dynasty retreated to Jiangnan, the climate was not constant and there were fluctuations. The Mongolians seized this window period. During the warm period, their economic and military strength developed greatly. They fought along the Danube River and established the largest military territory in Chinese history. Of course, this was also the result of the bravery and good fighting of the Mongols, but it also proved from the indirectly that the warm period was of great benefit to the development of the country.

The netizen who Zhao Bing recorded once quoted a scientific researcher's discovery that they used the annual rings of trees to reconstruct the historical climate temperature curve, and the collapse of dynasties in my country's history almost corresponds to the low temperature interval on the curve. The demise of the Qin Dynasty, the Three Kingdoms, the Tang Dynasty, the Song Dynasty, the Yuan Dynasty, the Ming Dynasty and the Qing Dynasty were all in the period below the average temperature or extremely cold in the past 2485 years.

Zhao Bing still vaguely remembered that 1271-1296 AD was a cold period, and it was also the period of the demise of the Southern Song Dynasty. He calculated with his fingers and was shocked. This year was the eleventh year of Xiangxing, which was converted into the 1289 AD. In other words, it was still in a cold period, and the temperature was still falling. It would take seven or eight years to pass the dangerous period.

It doesn't matter if this calculation is done. Zhao Bing secretly scolded himself for not choosing a good time to travel through time, so how could he reach such an unlucky node? Most of the past ten years have been spent in Qiongzhou, which has a tropical climate, which is so hot all year round and is not sensitive to the temperature. But now he has regained Jiangnan and fought in the Lianghuai region, which is only a short distance from the Central Plains.

Throughout the tropical region, he entered the subtropical zone, passed the temperature dividing line between the north and south, and then arrived at the northern temperate zone. Zhao Bing could feel the warmth and coldness. He also remembered that such a thing happened. He couldn't help but feel sick, lamenting that he was really at the wrong time. God was unfair, so he couldn't be a time traveler.

If the temperature in the desert is now rising, the rain is abundant, and winter is not so difficult. After being severely damaged, the Mongols will consider returning to their ancestors and returning to the desert to herd sheep. After eating and wearing warm clothes, they will not consider eating the hard walnut of the Song Dynasty. If they lack money, they will first consider developing to the northwest and stealing their own brothers.

Of course, you can also learn from Genghis Khan and Geer and his friends to join forces to retake the Western Expedition to harm Central Asia and West Asia. You can also go to Europe to take all the little lords of Europe, lead the knights to visit Africa, take a look at the pyramids, swim down the Nile River, and grab some gold and gems from the hands of "Lao Hei".

At that time, the world was peaceful, the world was unified, and the global national unity was achieved. The people of the Song Dynasty would also welcome you to do business, travel, and invest as foreign guests. How great is it! But now the weather is getting colder and colder, and the desert is colder. The Mongolians living there are hard life. In the past, there were subsidies from the court, and everyone could live a good life. But now the court lost Jiangnan and lost the taxes. Most of them were less than enough. They could only owe the subsidies again and again, and they could not live.

Two years ago, when the Mongolians stayed in the desert, the grasslands yelled to go south to ask for subsidies, but they were intimidated by the Han guards controlled by the court, and they did not dare to go south without orders. Now the Han guards have been killed by the Song army and are basically destroyed. The Khan had to "invited" them to go south to defend the Khan. Although the Khan owed subsidies, the opportunity was rare, and everyone still brought their families to defend the Khan.

Zhao Bing is actually quite worried about the real gold. There is no saying that "it is easy to invite gods and it is difficult to send gods." Now the largest army in the Han area of ​​the Mongolian Yuan Dynasty has almost been lost. The Qixue army, which is known as the elite, is only one name left. It is okay to coax outsiders, but it cannot fool the kings of the grassland sect. Although these people have lived in the desert for a long time and occasionally come to the Han area, they also play as commandos. After the war, they still have to go back to their hometown to continue herding horses and sheep.

However, these sect kings did not live a leisurely life. They had to prevent other brothers from coming to their territory to "visit" and "get things". Of course, when their lives were not easy, they would often visit their neighbors' houses, and by the way they would get some cattle and sheep, bring back some slaves, marry a few foreign women, and kill some ignorant guys. And when the thief Ali Buge and Haidu and others were about to invade the country, they would also accept some gatherings and bring their own bows and horses to participate in the battle.

Therefore, these sect kings beat themselves up by themselves if they have nothing to do, and they are fighting outsiders together if they have something to do. The combat effectiveness is not good. And the real gold that has lost the soldiers and lost the generals is naturally unconfidant and cannot be tough at all. Even if they want to take some money to coax them to their hometown, they touched their wallets and left some treasure money that was hard to wipe their butts. The sect kings who have been fooled many times will definitely not do it.

As for those sects who finally came to the Central Plains from a bitter and cold place, they were unwilling to go back again. It was warm and there was food to eat. If you had nothing to do, you could go to the Song Dynasty to fight grass valley. Since the court owed wages and had no money to go home, they just stayed to ask for wages or found a piece of land to make a living by themselves. The great knights couldn't watch us starve to death!
Chapter completed!