https://www.technologyreview.com/2024/01/25/1087027/climate-subsidies-inflation-reduction-act-mining-critical-minerals/
https://www.nao.org.uk/wp-content/uploads/2018/01/PFI-and-PF2.pdf
https://www.europarl.europa.eu/RegData/etudes/IDAN/2021/699811/IPOL_IDA%282021%29699811_EN.pdf