“Picture all of the stores, offices, houses and apartment buildings in our cities. Then consider the appliances and electronics used in them along with the heating and air conditioning. Add up all the electricity they use and the fuels burned inside them, and buildings are responsible for nearly one-third of greenhouse gas emissions in the United States.”

https://www.usnews.com/news/cities/articles/2020-06-23/why-cities-must-make-energy-wasting-buildings-more-efficient