Now the earth rotates much faster than before. Why faster?

According to the Daily Mail website, 202 1 will fly by, because the earth's rotation speed is the fastest in 50 years. The current duration is slightly shorter than the 24 hours stipulated in the past. Many researchers are discussing whether to delete one second to explain this change. In order to keep the rotation of the earth in line with the speed of the clock. Starting from 2020, it will take less than 86,400 seconds for the earth to complete one rotation, and the length of a day will be shortened by 1.4602 milliseconds. Now the earth is spinning faster than at any time in the past 50 years. The changes of the surface ocean, rivers, glaciers and airflow, the internal lava activities and the movement of the moon lead to the acceleration of the earth's rotation. Of course, this reason has not been specifically confirmed yet. The impact of a giant asteroid It is generally believed that the impact of giant asteroids will accelerate the earth's rotation, but it obviously did not happen in 2020, or even once in tens of millions of years. Caused by a huge solar wind. When the solar wind hits the earth's atmosphere at an oblique angle, it will also lead to the acceleration of the earth's rotation. But it didn't happen in 2020. The earthquake caused. Generally speaking, earthquakes of magnitude 8 or above will lead to changes in the earth's rotation speed. But from 2020 to now, there has not been an earthquake of magnitude 8 or above. So, which reason do you think is reliable? Personally, I think the first reason is more reliable: the changes of surface oceans, rivers, glaciers, airflow and internal lava. When glaciers and ice sheets melt and flow into the ocean, the mass of the earth will be redistributed, and the matter will be closer to the center than before, so the earth will rotate faster. This statement is most in line with the actual situation now. The increasing human activities have aggravated global warming. It is an acknowledged fact that the glaciers in the north and south poles of the earth are melting. However, it should be noted that the specific reasons for the speed increase have not been found yet, and they are all guesses at present. Don't worry about the impact on human beings. Only1.4602ms is added every day. According to calculation, 202 1 is expected to become "the fastest day in history". The average daily time this year will be 0.2 seconds faster than in previous years. Ordinary humans can't feel it.