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公元前四千年,极地冰峰的一次突然崩塌戏剧性地导致了一次全球泛围的气候冷化,地中海与欧洲大部分地区由于遭受到冷空气的袭击,非洲的降雨带也发生了变化,历时数千年的湿润气候造就了肥沃苍茫的大草原。
A sudden collapse of the polar ice peak in the fourth millennium BC dramatically led to a global warming of the climate, with the Mediterranean region and most parts of Europe affected by cold air and the rainfall in Africa also changed, Millennium humid climate created a fertile prairie.