Why is winter in Harbin not as cold as it was in the 1990s?

There are several reasons why it is not as cold as it was in the 1990s. The first global warming trend. Second, now people have a stronger sense of keeping warm, and clothes have a better effect of keeping warm. Third, the heating system is adequate now. This way, you don't have to stay at home to keep warm and not feel too cold. When you feel cold at home, it will start automatically and take self-protection measures.