[2] click here
[3] https://na.unep.net/geas/archive/pdfs/geas_jun_12_carrying_capacity.pdf
[4] Study: US is an oligarchy, not a democracy - BBC News - BBC.com
https://www.bbc.com/news/blogs-echochambers-27074746
[5] wikipedia.org/wiki/Capital_in_the_Twenty-First_Century
[6] click here
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