has not been felt for 66 million years. 已经是6600万年前的事了
is heating our planet faster than at any time in the last 500 million years. 正在以五亿年来从未有过的速度 令地球升温
an unbroken line of ancestry stretching back four billion years 一条绵延40亿年的连续谱系
stable sanctuaries for life for over 50 million years, 为生命提供稳定的庇护所 超过5000万年
left Africa millions of years earlier 在数百万年前离开非洲
and have been hunting bison in America for more than 100,000 years. 其在美洲捕杀野牛的历史 已经超过10万年
So when the Ice Age hit two and a half million years ago, 所以 2500万年前 当冰河时代突然袭来之时