https://library.wmo.int/doc_num.php?explnum_id=10108
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/970229/Industrial_Decarbonisation_Strategy_March_2021.pdf
https://wiiw.ac.at/assessing-the-international-interlinkages-and-dependencies-of-the-eu27-energy-renewables-ecosystem-dlp-6897.pdf
https://theconversation.com/the-federal-union-how-a-group-of-1940s-economists-dreamt-of-a-european-union-for-the-working-classes-231614