ENVE Urban Systems Practice Exam

Cities drive around two-thirds of global greenhouse gas emissions. This happens because urban areas concentrate energy use for buildings, heating and cooling, lighting, transport, and industrial activity, all of which consume large amounts of energy in a relatively small area. The high density of people and infrastructure means emissions per area tend to be high, and urban systems are the backbone of economic activity, which further concentrates energy demand. Because of how we measure emissions — production-based within city boundaries or consumption-based accounting that includes energy embedded in goods and services consumed by city residents — the number commonly cited sits around 66%, a reasonable and widely used approximation. It’s larger than half and smaller than three-quarters or more, and figures like 75% or 90% reflect different definitions or methods rather than a single standard.