https://wwfeu.awsassets.panda.org/downloads/ets_revenues_report_2022___web___final.pdf
https://cepr.org/sites/default/files/policy_insights/PolicyInsight92.pdf
https://www.ippr.org/files/2018-03/cej-our-common-wealth-march2018.pdf
https://www.smf.co.uk/wp-content/uploads/2024/04/Labour-Economics-April-2024.pdf