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自然科学研究成果显示,距今4000年-3500年期间全球气温有过明显下降,这一降温事件对当时人类的活动产生了重大影响。建国前的商人正处于此次气候发生变异的时期,其活动地域的南迁与气候变化紧密相关。
Natural science research shows that from 4000 to 3500 years ago, the global temperature has dropped significantly. This cooling event had a significant impact on human activities at that time. Before the founding of the People’s Republic of China was in a period of climate change, the relocation of its area of activity is closely related to climate change.