https://chemsec.org/echas-5-year-review-paints-dark-picture-but-there-is-hope/
https://globalabc.org/sites/default/files/2021-10/GABC_Buildings-GSR-2021_BOOK.pdf
https://www.ussif.org/files/GSIR_Review2018F.pdf
https://www.socialeurope.eu/powering-up-the-eu-and-solar-energy