Lieth H
Radiat Environ Biophys. 1976 Dec 23;13(4):329-35. doi: 10.1007/BF01331177.
A first analysis of intelligence vs. biomass development in humans shows that the increase of speed to accept new inventions appears not to keep pace with exploding population size. It is suggested to assess more accurately the "collective intelligence" of the human race, an attempt probably useful for several purposes. An equation is presented and used to calculate an upper human population limit for the world suggested by the present intelligence level. The equation suggests 1.5--2.3 billion people educated to the level of industrialized nations. The equation predicts acceptance times for innovations during the early evolution of mankind in the order of 10(6) years. Such a time span seems to be in accordance with archaeological findings for the acceptance of fire as a common tool.
对人类智力与生物量发展的初步分析表明，接受新发明的速度增长似乎跟不上人口规模的爆炸式增长。建议更准确地评估人类的“集体智慧”，这一尝试可能在多个方面有用。提出了一个方程，并用于计算当前智力水平所暗示的世界人口上限。该方程表明，受过工业化国家水平教育的人口上限为15亿至23亿。该方程预测，在人类早期进化过程中，创新的接受时间约为10^6年。这样的时间跨度似乎与将火作为常用工具的接受情况的考古发现一致。
