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About 94% of the population increase and almost 100% of the rise in the World Gross Product have happened since 1500 BCE. The value of the global economic activity, as measured by the World Gross Product, a proxy for consumption, had risen from approximately US$1 billion around 4000 BCE to about US$78 trillion ( Wikipedia 2020 Worldbank 2015) by 2014, both in 1990 International US Dollars. Consider that while the earth and its energy budget from the Sun have remained roughly constant over the past 4000 years, the human population has risen from approximately 7 million around 4000 BCE to more than 7 billion ( Worldmeters, 2020) at present. The demands of humans on the earth have grown considerably with the human population and the increase in per capita consumption of all kinds (fuels and energy, food, water, minerals, etc.).
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