The building sector has been identified as a sector with large potential for delivering energy savings and mitigation of GHG emissions. Yet it has been unclear what the specific role of building energy efficiency codes play in achieving these savings.
This chapter aims to update the knowledge on the building sector since the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) from a mitigation perspective. Buildings and activities in buildings are responsible for a significant share of GHG emissions, but they are also the key to mitigation strategies.
Urban density significantly impacts urban energy use and the quality of life of urban residents. Here, the authors provide a global-scale analysis of future urban densities and associated energy use in the built environment under different urbanization scenarios. The relative importance of urban density and energy-efficient technologies varies geographically.