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商周和唐宋時比現在溫度高得多。朝代通常轉換在低溫幹旱期間,因那時糧食生產不佳,民不聊生,只好揭竿而起,於是朝代往往在這時轉換,明代崇貞皇帝其實不是那麼糟糕,但老天卻不照顧它,那是正是全球進入小冰川低溫幹旱時期,明朝內受饑民起義,外受後金雙重夾擊,終於垮掉。