他们认为，人类在史前对猛犸象的猎杀或对气候变迁造成了明确的影响。
They argue that mankind’s prehistoric penchant for mammoth may have had a discernible effect on climate.
如果人类能够避免丧心病狂，如果能够控制不可避免的气候变迁，我们一定会去追寻那些能够得到的最好的选择。
If humanity is to avoid the unmanageable and manage the unavoidable of climate change, we must pursue the best options available.
虽然这并不是经常的被注意到，物种的变迁在有规律的根据地球和人类的条件发生着改变。
Although it is not often noticed, species come and go quite regularly according to needs of the Earth and Humankind.
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