The main reason for the warming weather.

1, solar activity: Some experts believe that the current climate warming is related to the solar cycle and has little to do with human activities. Russian scientists believe that the warming cycle of Mars is consistent with that of the Earth, and the main reason is the sun.

2. Decrease of cloud cover: The change of solar activity will change the cloud cover over the earth, amplify the influence of the sun on the earth, and thus affect climate change. They speculate that cosmic rays emitted to the earth can stably ionize part of the atmosphere, making it easy for clouds to form, thus absorbing a lot of solar radiation and lowering the temperature of the earth.