A large share of global greenhouse gas emissions is ultimately attributable to cities, which are centers of economic activity, consuming energy and other resources and generating waste. By some estimates, cities are responsible for two-thirds of global energy consumption, and this proportion is expected to grow further . Yet, per capita emissions in some cities are significantly lower than the corresponding national per capita averages. Within cities, wealthier residents tend to generate more emissions than poorer ones, while the impacts of disasters and extreme events are most acutely felt by the poor.
The variation in per capita emissions across cities results from differences in wealth, sectoral specialization, energy sources, the general climate, and the structural efficiency of the urban form, which includes buildings and transport infrastructure.
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