In Cambridge, more than 80% of greenhouse gas (GHG) emissions come from buildings. Since 2014, the Building Energy Use Disclosure Ordinance (BEUDO) has required buildings over a certain size to report energy use to the City (50+ units for residential, and 25,000+ square feet for commercial.) Amendments passed in 2023 require commercial buildings that meet size thresholds to reduce their GHG emissions on specific timelines.