The maximum temperature in some areas of 11 provinces, autonomous regions and municipalities including Chongqing and Zhejiang exceeds 40℃. Why is the weather so extreme this year?

Extreme high temperature warnings and heavy rain warnings come frequently. The main reason for extreme weather is that the emission of greenhouse gases leads to global warming. The earth has a natural feedback mechanism to climate changes. Through this, the earth The mechanism adjusts the climate to maintain the stability of the earth's climate system. Without such a mechanism, the earth's climate will go to extremes, eventually leading to the collapse of the ecosystem. Extreme weather is part of this feedback mechanism.

Causes of extreme weather. In the 4.6 billion-year history of the earth, the movement of the earth's plates has had a huge impact on the earth's climate. At the same time, the Earth's orbit around the sun will change, and such changes will cause the Earth to enter major and minor ice ages. There have been four major ice ages in the history of the earth, each time interval is about 200 to 300 million years, and during each ice period there will be a fluctuation trend that first rises and then falls. Humanity is just in the fourth glacial cycle. The fourth great glacial age began 2 to 3 million years ago, and it took about 90,000 years to grow before entering the ice age.

For hundreds of years since the Industrial Revolution, the burning and development of fossil fuels has caused an increase in the amount of greenhouse gases such as carbon dioxide emitted into the atmosphere. When greenhouse gas emissions such as carbon dioxide double, the global temperature will rise by about two degrees, reaching a maximum of about five degrees. The increase in temperature will directly affect the flow of air and the difference in air pressure. This difference can form typhoons, tornadoes, heavy rain and hail.

The impact of extreme weather. Greenhouse gases have a huge impact on the earth. They not only cause extreme anomalies in local weather, but also cause temperatures to rise and melt ice and snow around the world, including the Tibetan Plateau, the Arctic and Antarctic, and the permafrost in the northern hemisphere. Rising sea levels will accelerate extreme changes in weather. Although the greenhouse effect offsets the impact of the ice age on humans, as the number of humans decreases and the earth adjusts itself, the earth's environment will regain balance, and the largest ice sheets will appear.