Why? The global climate is getting cold?

In fact, global cooling is not a new theory. The global cold weather of 1947-1976 made many meteorologists exclaim that "the Little Ice Age is coming". As early as 1940s, Milankovic proposed that the periods of the earth's orbital eccentricity, ecliptic angle and precession were 654.38 million+years, 40,000 years and 20,000 years, respectively, which led to the changes of the earth's climate at the end of Cenozoic during the glacial and interglacial periods (that is, Quaternary). In 1970s, a series of geological data, including deep-sea rock cores, coral reefs, pollen, tree rings and ice cores, proved the existence of this cycle. 1972, 1 In June, more than 20 European and American scholars who had just made great contributions to Milankovitch's theory gathered at Brown University in the United States to discuss "when and how to end the current interglacial period". After the meeting, Quaternary research also published the album "The End of the Current Interglacial Period". In the 1990s, the global climate was warming rapidly, and the greenhouse effect and global warming became the focus of international research. However, scientists have never stopped studying global cooling, and research results supporting "the coming ice age" have been published from time to time. 1997, M. E. ram yo published a paper in Paleoceanography, saying that the Holocene has passed 10,000 years as an interglacial period, and if there is no human interference, the next glacial period has arrived. From June 5438 to October 2008 10, Thomas J. Coeroli, a professor of geophysics at the University of Edinburgh in the United Kingdom, published a paper in Nature, summarizing his research for more than 20 years. He believes that the earth is entering a new ice age, the northern hemisphere will be greatly affected, and parts of Europe, Canada and Asia will probably be covered under permanent ice sheets, but the release of a large number of greenhouse gases seems to prevent the earth from entering this cycle. However, some Russian astronomers believe that changes in solar brightness and solar activity have the greatest impact on the earth's climate. As the luminous intensity of the sun will gradually decrease in the next few decades, the sun will enter a period of negative activity, and the temperature of the earth will also decrease accordingly.