这项研究表明，只要这个未知极限水平一直不为人类所知，随着二氧化碳含量的增加，总有一天大气中的二氧化碳含量水平达会到这个极限，从而引发象上新世时期的气候。
While that level remains unknown, this research indicates that by increasing carbon dioxide levels, humans could reach the threshold that would induce a Pliocene-like climate.
研究同时表明，太行山中段上新世晚期以来的隆升主要发生于上新世末到早更新世时期。
It is shown that the uplift of the middle Taihang Mountains occurred mainly between the end of Pliocene and Early Pleistocene.
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