We're Killing Ourselves, in which he tries to sketch life in the year 2000.
“我们正在自杀”,在这本书中他简述了2000年的生活。
It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.
看来人类早就致力于探索四季变迁了,比人们想像的要早20,000年。