https://www.bruegel.org/analysis/struggle-cut-emissions-international-aviation-and-shipping
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/970229/Industrial_Decarbonisation_Strategy_March_2021.pdf
https://www.europarl.europa.eu/RegData/etudes/BRIE/2022/734677/EPRS_BRI(2022)734677_EN.pdf
https://futuros.gob.es/sites/default/files/2023-09/RESILIENTEU2030.pdf