https://www.brookings.edu/articles/making-emissions-count-in-country-classifications/
https://wiiw.ac.at/oeffentliche-investitionen-und-sozialstaat-perspektiven-der-budgetpolitik-im-kontext-von-energiekrise-klimawandel-und-eu-budgetregeln-dlp-6484.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef22029en.pdf
https://www.esri.ie/system/files/publications/RS179.pdf