Fig. 4: Annual carbon emissions (normalized) for baseline, shallow, and deep retrofit scenarios, with current and projected grid emissions factors and with and without 100% rooftop photovoltaics deployment.
From: Carbon reduction technology pathways for existing buildings in eight cities

Where applicable, carbon emission targets are shown in red lines. While many cities can meet their near-term carbon emissions reduction targets, meeting their long-term targets will require grid decarbonization and end-use electrification.