Fig. 4: The optimal carbon emission reduction pathways for varying cumulative carbon emission reduction targets.
From: Reducing transition costs towards carbon neutrality of China’s coal power plants

a The transition costs under different cumulative carbon emission reduction targets (CuER). b The optimal carbon emission reduction pathways (CERPs) for varying CuERs (the solid and the dashed lines represent the optimal and the least effective CERPs, respectively; the line colors in (b) correspond to the dots’ colors in (a); deep decarbonization in this study refers to an 80% reduction in carbon emissions from 2020 levels).