https://www.un.org/en/climatechange/climate-solutions/cities-pollution
https://www.eia.gov/consumption/commercial/data/2012/c&e/cfm/e1.php
https://www.researchgate.net/publication/324991116_The_Role_of_Exergy_in_Energy_and_the_Environment
https://commission.europa.eu/strategy-and-policy/priorities-2019-2024/european-green-deal_en
https://joinhorizons.com/new-china-infrastructure-plan-opportunities/