A recent study by the McKinsey Global Institute found that 10% of all energy worldwide is consumed by commercial real estate sites. Commercial buildings, as defined in the study, include a broad array of non-manufacturing structures such as hotels, hospitals, restaurants, warehouses, retail stores and office buildings. Stated another way – one out of every ten BTUs of energy produced is used to heat, cool, power or light buildings. This statistic may surprise you, but commercial energy usage is relatively small when compared to residential household consumption. Residences utilize 2.5 times more energy annually than businesses. Commercial energy usage is small relative to the transportation sector. The ground and air transportation sectors consume almost 2 times as much. Nonetheless, commercial buildings represent a significant energy user and therefore a worthwhile candidate for exploring efficiency initiatives to support the environment.