Scientists believe that global warming may be caused by changes in solar activity. In recent years, we can all clearly feel the rise in temperatures, especially in the summer months, when the earth is getting hotter and hotter. The temperature is gradually rising every summer, and although this rate is not fast, in the long run, many hot areas may no longer be suitable for human survival in more than a decade. 
Many countries have realized the importance of protecting the environment. However, in the previous two years, a scientist made an unusual point: global warming is not closely related to human activity. Most people usually think that global warming is due to the excessive amount of carbon dioxide emitted by humans, the reduction of oxygen levels due to the cutting down of trees, and thus the rise in temperatures. Therefore, people have taken measures to protect the environment, such as returning farmland to forests, but the earth's environment has not been improved. 
The scientist believes that the increasing heat of the Earth's environment may be due to the gradual shrinking distance between the Earth and the Sun, and although this shrinkage is slow, it does exist. In addition, the sun may also enter an active period, during which the temperature of the sun naturally increases. If there is no change in the distance of the Earth from the Sun, then the temperature on the Earth will also gradually increase as the temperature of the Sun increases. In addition, this topic has also sparked a lot of people's **, there is indeed a possibility that solar flares or sunspots will cause the temperature of the sun to rise. 
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Although this view may be correct, it does not affect our determination to protect the natural environment. After all, after the industrial revolution of mankind, the gradual decline of species and the gradual increase of smog were real. Therefore, in our daily life, we should pay attention to energy conservation and emission reduction as much as possible, and do our part to protect the environment.