地球历史上有很多尚未揭示的奥秘，例如距今约350 ~ 250万年前的全新世中期地球气候变化的根本原因一直都是个谜。
09051903 One of the mysteries of the Earth's history is the fundamental climate change in the Mid Pliocene, about 3.5-2.5 million years ago.
公元前9000年到5000年这段时期被称为全新世气候暖期(Holocene Climate Optimum)，这种气候就像地中海海滨的温暖午后一样惬意。
The time from 9, 000 to 5, 000 BC is called the Holocene Climate Optimum, which makes it sound like a nice afternoon on a Mediterranean beach.
地质学家们称，我们已经生活在人类纪——人的时代，而不是仍将人类放在约1000年前开始的特别稳定的年代——全新世。
Rather than placing us still in the Holocene, a peculiarly stable era that began only around 10, 000 years ago, the geologists say we are already living in the Anthropocene: the age of man.
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