The Five Emperor's era is the turning period of the early new period of climate humidity to enter the late new world dry period。Archaeological Digesty，The climate was moist in the early stage of the Five Emperor's era。The area of ​​the Yangshao Cultural Site bet365 Play online games is small and decentralized in the low ground，The transition zone between high and low land is quite dense，indicates that the area of ​​low water waters is large。to the Longshan period，Central Plains Lake Swamp Land decreased，Increased plowing area，Longshan Cultural Site has increased the fastest at low terrain。According to various historical materials, it can be considered，4200 to 4000 years ago, a climate mutation from wet to dry，After entering the Xia Dynasty, it is a continuous drought period。& ldquo; Dayu's water treatment & rdquo; occurred bet365 live casino games in the conversion period of the climate from wet to dry。Research on Climate Research，In the Five Emperor's era, the northern precipitation decreased by 10%& mdash; 20%。There are two climate mutations in the meter，One is the end of the humid period 5500 years ago。Studies from Gao Jiangtao indicate，From the middle of Yangshao to the late stages，The proportion of farming tools increases，and the proportion of fishing and hunting tools decreases，Can explain a certain problem。The second is the drought period of entering the new world from 4200 to Bet365 app download 4000 years ago，Related historical records、Both climate and ancient environmental data can be demonstrated the existence of this mutation，The moist index in the south decreases more obvious。The climate of the Five Emperor changed from wet to dry，is part of the new trend of climate change。Two climate mutations are related to the weakening of the North Atlantic ring.，and the weakening of the solar activity may be the reason for weakening the circulation。

(Source: "Chinese History Theoretical Cong" 2011 Issue 2 Huang Weizheng/Pick)