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The two great economic revolutions that marked human history up to 1900—the agricultural and industrial revolutions—greatly increased the Earth's human carrying capacity, allowing human population to grow from 5 to 10 million people in 10,000 BCE to 1.5 billion in 1900. [44]
Attempts have been made to estimate the world's carrying capacity for humans; the maximum population the world can host. [131] A 2004 meta-analysis of 69 such studies from 1694 until 2001 found the average predicted maximum number of people the Earth would ever have was 7.7 billion people, with lower and upper meta-bounds at 0.65 and 98 billion ...
Harm's Way promoted the album with music videos for "Become a Machine" [7] and "Last Man", [8] and online streams of "Human Carrying Capacity" and "Call My Name". [9] Critics generally gave Posthuman favorable reviews, with several reviewers noticing an increased emphasis on industrial metal and nu metal over previous releases.
Many studies have tried to estimate the world's sustainable population for humans, that is, the maximum population the world can host. [5] A 2004 meta-analysis of 69 such studies from 1694 until 2001 found the average predicted maximum number of people the Earth would ever have was 7.7 billion people, with lower and upper meta-bounds at 0.65 and 9.8 billion people, respectively.
By war, with or without weapons of mass destruction, starvation, disease, rape, murder, ethnic cleansing, concentration camps, and other horrors beyond the imagination, when humanity has exceeded the carrying capacity of the Earth. By the voluntary action of all of humanity prior to the human population exceeding the carrying capacity of the Earth.
The 1972 book The Limits to Growth discussed the limits to growth of society as a whole. This book included a computer-based model which predicted that the Earth would reach a carrying capacity of ten to fourteen billion people after some two hundred years, after which the human population would collapse. [7]
A cultural heritage can outlast the conditions that produced it. That carrying capacity surplus is gone now, eroded both by population increase and immense technological enlargement of per capita resource appetites and environmental impacts. Human life is now being lived in an era of deepening carrying capacity deficit.
In this way humans are currently exceeding the carrying capacity of Earth as we increase the ecological overshoot each year. The IPAT equation attempts to quantify the environmental impact ("I") of the human population ("P"), their affluence ("A") and technology ("T").