“Remember that impact is the product of two factors: population multiplied times impact per person.”

—  Jared Diamond , book Collapse: How Societies Choose to Fail or Succeed

Source: Collapse: How Societies Choose to Fail or Succeed (2005), Chapter "The world as a polder: what does it all mean to us today?", section "Reasons for hope" (Penguin Books, 2011, page 524, ISBN 978-0-241-95868-1.

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Jared Diamond 33
American scientist and author 1937

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“The inescapable conclusion is that the direct contribution of man-hours and capital accumulation would hardly account for more than a tenth of the rate of growth in per capita product — and probably less. The large remainder must be assigned to an increase in efficiency in the productive resources, or the effects of changing arrangements, or to the impact of technological change, or to all three”

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“Technology magnifies the ability of one person to have a big impact on other people. If that doesn't scare you, then the next time you see professional wrestling on television, look at the crowd shots and ask yourself if you'd like those people to have a bigger impact on your life.”

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“In fact, one of the main lesson to be learned from the collapses of the Maya, Anasazi, Easter Islanders, and those other past societies (as well as from the recent collapse of the Soviet Union) is that a society's steep decline may begin only a decade or two after the society reaches its peak numbers, wealth, and power. […] The reason is simple: maximum population, wealth, resource consumption, and waste production mean maximum environmental impact, approaching the limit where impact outstrips resources. On reflection, it's no surprise that declines of societies tend to follow swiftly on their peaks.”

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Source: Collapse: How Societies Choose to Fail or Succeed (2005), Chapter "The world as a polder: what does it all mean to us today?", section "One-liner objections" (Penguin Books, 2011, page 509, ISBN 978-0-241-95868-1.

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“Faith as ultimate concern is an act of the total personality. It happens in the center of the personal life and includes all its elements. Faith is the most centered act of the human mind. It is not a movement of a special section or a special function of man's total being. They all are united in the act of faith. But faith is not the sum total of their impacts. It transcends every special impact as well as the totality of them and it has itself a decisive impact on each of them.”

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“"That's the way it works in movies," said Suzanne. "Something happens that has an impact on someone's life, and based on that impact, his life shifts course. Well, that's not how it happens in life. Something has an impact on you, and then your life stays the same, and you think, 'Well, what about the impact?'”

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You have epiphanies all the time. They just don't have any effect."
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“[The principal characteristic of this economic epoch is] a sustained increase in per capita or per worker product, most often accompanied by an increase in population and usually sweeping structural changes.”

Simon Kuznets (1901–1985) economist

Source: Modern economic growth,(1966), p. 1, as cited in: Amitava Krishna Dutt, ‎Jaime Ros (2008) International Handbook of Development Economics. p. 48; Definition of "modern economic growth"

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