The main cause of abnormal weather is man-made. No one came out to solve it?

Man's influence on nature is negligible. Global climate change is an important topic in scientific research. The factors affecting climate change are very complicated, involving solar radiation and solar activity, the earth's cosmic environment, atmospheric circulation, ocean circulation and air-sea coupling, as well as various movements of the earth itself, such as volcanic eruption and rotation changes. The relationship between drought and flood disasters and sunspot activity cycle points out that in the year with the least sunspot relative number, there are more floods in the Yangtze River basin, and there are more droughts in the Yangtze River basin at the peak of sunspot activity. The changes of annual rainfall and atmospheric pressure in Beijing since 1900 show that the average annual rainfall in Beijing in the past hundred years is 623mm；; There is a periodicity of 1 1 year and 22 years between the annual rainfall change and the atmospheric pressure change in Beijing, and the annual rainfall change is negatively correlated with the relative number of sunspots, that is, when the relative number of sunspots decreases, the annual rainfall in Beijing is often more than the annual average rainfall, and the rainfall in the wet season of sunspots is often less, so attention should be paid to drought prevention. This relationship can be used as a reference factor to predict the annual rainfall in Beijing. In a word, the climate change, drought and flood of the earth are closely related to solar activities.

The influence of the earth's cosmic environment on the climate. The earth is a planet in the solar system. The sun leads the members of the solar system to live about 8.5kpc away from the center of the Milky Way and 8pc north of galactic plane, and travels around the center of the Milky Way at a speed of about 250 km/s, once every 230 million years. At the same time, the earth follows the sun and moves back and forth on the galactic plane at a speed of 80pc, with a period of about 67 million years. According to the evidence of glacier activity found, there have been four major glacier activities in the earth's climate since 600 million years ago. During the Great Glacier, the weather was very cold, some species became extinct, the polar ice layer increased, and the sea water cooled and contracted, which led to the global sea level decline. These four ice ages were the periods when the sun led the earth and other members of the solar system across the galactic plane.

China is an ancient civilization with the longest recorded climate change. Tens of thousands of Oracle bones have been unearthed from Yin Ruins in Anyang, Henan Province, and it is recorded that "it rained tonight and an elephant was caught", that is, it rained while hunting. Archaeology also found extinct mammalian fossils, such as tapirs, elephants and buffaloes, indicating that the climate in Henan was warmer and wetter more than 2,500 years ago than it is now. Zhu Kezhen, a scientist from China, systematically demonstrated the climate change in China in the past 5,000 years from archaeological data and historical records. He investigated the distribution law of abnormal severe winter in historical period:111year. Historical records show that Taihu Lake is completely frozen and can be opened to traffic on ice. Citrus planted in the mountains near Taihu Lake all froze to death; It often snowed in Hangzhou until the end of spring. At1153 ~1155, a section of the canal in Suzhou often freezes. It seems that/kloc-the temperature in Beijing during the Southern Song Dynasty in the early 2nd century was colder than it is now. Why did the Great Ice Age occur when the earth crossed galactic plane? There is no satisfactory explanation at present. It is generally believed that galactic plane is a densely populated area of stars, interstellar matter and dust nebulae. When the solar system passed through galactic plane, the solar radiation was seriously absorbed, which led to the decrease of solar radiation received, resulting in the Great Ice Age on the earth.

Influence of Earth's Orbit and Rotation on Climate

When the earth revolves around the sun, it will be disturbed by the gravity of other planets (mainly Jupiter), thus changing the orbital parameters and affecting the climate. Milankovic, an astronomer from the former Yugoslavia, demonstrated the relationship between the Little Ice Age of 20,000 years and the Earth's orbital parameters: eccentricity, ecliptic angle and perihelion. (1) Variation of the eccentricity of the earth's orbit: the earth's orbit is elliptical, and the eccentricity of the orbit changes from 09.5j0005 to 0.0607 under the planetary perturbation, with a period of about 95,000 years. The change of the eccentricity of the earth's orbit makes the amount of sunlight received by the earth change, and the maximum is about 1%. When the eccentricity of the earth's orbit is large, the amount of radiation received near the perihelion increases in one year, and the winter in the north becomes warmer. After the Quaternary, the ice age appeared in the period when the eccentricity of the earth's orbit was the smallest. The interglacial period appeared in the period with the largest eccentricity. (2) Variation of declination angle: The declination angle of the earth's rotation axis varies from 22 degrees to 20 degrees 30', and the change period is about 4 1 0,000 years. Because the position of the Tropic of Cancer and the South Arctic Circle on the earth is determined by the ecliptic angle, it will affect the change of sunshine in high latitudes. When the declination angle decreases, the amount of radiation received in middle and high latitudes, especially in high latitudes, will be significantly reduced; When the declination angle increases, the higher the latitude, the more radiation is received. When the declination angle reaches the maximum, the solar radiation received by the polar region can increase by 4.02%. (3) Perihelion precession: due to planetary perturbation, the perihelion precesses in Earth orbit, with an average period of about 2. 1.7 million years. At present, winter in the northern hemisphere is near perihelion. 12750, perihelion will be near the current apohelion, and winter in the northern hemisphere will be at apohelion. This will lead to the change of sunshine in different seasons in the northern and southern hemispheres and affect the great change of global temperature. At present, the time for the earth to pass the perihelion is 65438+1October 3 or 4 every year, and the time for passing the perihelion is July 2 or 3 every year. The precession direction of perihelion is consistent with the revolution direction of the earth.

The earth's rotation is influenced by the tidal force of the sun and the moon, which will trigger the tidal friction of the ocean and produce a couple moment opposite to the angular velocity of the earth's rotation, which will lead to the long-term slowdown of the earth's rotation and increase the daily length unit at the rate of 0.002 seconds every hundred years. In addition, due to the air-sea coupling and the tidal force of the sun and the moon, the earth's rotation not only slows down for a long time, but also has periodic changes on annual, semi-annual, seasonal and short-term scales, which will also affect global climate change.

History records extreme weather changes in many periods, and the influence of human social activities on climate is not the main reason.