https://www.socialeurope.eu/progressive-taxation-for-a-renewed-social-contract
http://www.economics-ejournal.org/economics/journalarticles/2017-10
https://cepr.org/system/files/publication-files/173807-geneva_25_climate_and_debt.pdf
https://www.esri.ie/system/files/publications/SUSTAT123_2.pdf