Why is the weather now, sometimes very hot in winter? Is it cold in spring?

The climate is abnormal and prone to extreme weather. It's all because human beings over-exploit and consume the limited resources of the earth, and the population has been growing, which has caused all kinds of environmental pollution, especially air pollution, which nature can't "metabolize". Nowadays, the popularity of air conditioning will also cause changes in climate and temperature, which is a man-made reversal, so the future climate anomaly will only become more and more serious.