https://www.imf.org/en/Publications/fandd/issues/2022/09/Bullet-train-Adrian-Mancini-Griffoli
https://www.theguardian.com/world/2023/sep/21/italy-po-valley-blighted-air-pollution-worst-europe
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/fomeef18001en.pdf