https://www.progressivepolicy.org/wp-content/uploads/2021/12/PPI_Natural-GasDec2021.pdf
https://www.socialeurope.eu/powering-up-the-eu-and-solar-energy
https://www.brookings.edu/essay/why-are-fossil-fuels-so-hard-to-quit/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=89176716&utm_source=hs_email
https://www.energycharter.org/fileadmin/DocumentsMedia/CCDECS/2019/CCDEC201908.pdf