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公元前5000年到公元前3500年,在人与人、族群与族群完全隔绝的状态下,古代四大文明几乎同时在北半球形成。如何解释这个现象?从一万年来挪威雪线的变化可以发现,这一阶段是全球气候温暖期,气候变化幅度小,为人类早期文明的发展提供了稳定的气候背景。人类早期的文明几乎都是农业文明。气候温暖期,高山冰雪融化加快,一些受影响的大河河谷地区有了充沛的水资源维持农业生产和牲畜饲养,随之人口大量涌入,开始出现城市。在
From 5000 BC to 3500 BC, with the complete isolation of people, ethnic groups and ethnic groups, the ancient four major civilizations were formed almost simultaneously in the northern hemisphere. How to interpret this phenomenon? From the change of Norwegian snow line in 10,000 years, we can find that this stage is the global climate warm period and the small amplitude of climate change, which provides a stable climate background for the development of mankind’s early civilization. Almost all of the early human civilizations were agricultural civilizations. During the warmer climate, snow and ice in the mountains have been melting, and some of the affected river valleys have abundant water resources to sustain agricultural production and livestock raising. As a result, a large influx of population began to emerge. in