Why does wood become the main building material in China?

In ancient China, working people adapted to local conditions and used materials, thus creating different styles of buildings. In the middle reaches of the Yellow River, the loess layer is thick and loose, which is beneficial to agricultural production. In the late Neolithic period, people settled here and multiplied, becoming the cradle of ancient culture in China. At that time, the climate in this area was warmer and wetter than it is now, with dense forests. Since ancient times, wood has gradually become the main building material in China. In order to resist the cold, the houses in the north face south, so that sunlight can enter the room in winter, and fire pits and thick external walls and roofs are used. The appearance of this building is heavy and solemn.