The authoritative experts interviewed by BBC think so.
The universe is full of cosmic rays, which originate from supernova explosions and pass through the atmosphere. Because more than 70% of the earth's surface is water, cosmic rays are injected into the ocean in large quantities, which promotes the separation of water molecules and volatilizes into the atmosphere in the form of water vapor, and the water vapor in the atmosphere gathers into clouds.
Clouds formed by water vapor are very good heat preservation gases. Solar radiation will be reflected when it hits the ground. If there is no cloud in Wan Li, it will directly reflect back into the universe. However, if there is a cloud, it will be intercepted by the cloud on the way to lay the reflection, and it will be reflected back to the earth again to play a role in heat preservation.
However, although the "supply" of cosmic rays is stable, there is another factor, and that is the solar wind.
When sunspots erupt, the stronger the solar wind is. The solar wind will blow away cosmic rays near the earth. When there are few cosmic rays, there will be less water vapor in the earth's atmosphere, and the clouds will be thin, and the thin clouds will lack the function of heat preservation, and the earth's climate will become cold.
The eruption of sunspots also has certain rules.
According to the observation of the sun, sunspot activity was not very frequent until 2000, but it has increased in recent years. I don't know if this has anything to do with volcanoes and earthquakes, but don't you think it's a little cold this winter?
According to historical data, from the end of World War II to 1975, the global climate gradually cooled, and then from 1975 to 2000, the climate was warming, but after 2000, especially in recent years, the climate did not continue to warm. Some experts believe that the climate has begun to get colder. (And it can be seen from this data that after World War II, it was an industrial recovery period, and the emission of carbon dioxide would not consider climate factors. As a result, the climate became cold, further indicating that carbon dioxide has nothing to do with climate. )
To sum up, I think the process of climate warming is actually the normal change of the earth's climate. There was a warmer period on earth than now in history, that is, the Middle Ages, when the world society was quite rich, and most famous churches in Europe were built at that time, while in China, it was experiencing the peak of feudal society-Kaiyuan Shi Sheng! In addition, the industrial revolution was a famous ice age in history. At that time, the Thames was frozen, and vendors often set up shop on the ice in winter. I think the change of temperature is as normal as four seasons in a year. As for the ice age, if I'm right, there must have been a lot of solar activity during that period.