*3.2. The Structural Changes of Carbon Flow Sankey Diagrams*

After getting the full picture of carbon emissions allocation, to evaluate the structural changes more comprehensively, we conducted TRO index decomposition of each section in the diagram to compare the situation of energy-related carbon emissions. The results of the TRO index decomposition of several important sections including energy sources, three passive systems (vehicle, building and factory), and final services are shown as Table 3 and Figure 5. In the following text, the results of each section are discussed one by one and are compared with relative policies, other statistics, and other studies to verify the method.


**Table 3.** The TRO index decomposition of relevant sections.

<sup>1</sup> *Abbreviations*: Agro-V: Agro-vehicle; H/CS: Heated/cooled space; ILLS: Illumination space; TC: Thermal comfort; COMM: Communication; ILL: Illumination. <sup>2</sup> The total amount change of carbon emissions here is calculated as carbon dioxide while the data in Sankey diagrams are calculated as carbon element.

**Figure 3.** China's energy-related carbon flow diagram in 2005, unit in 10 Mt C (107 tons

 C).

*Energies* **2020** , *13*, 2076

**Figure 4.** China's

energy-related

 carbon flow diagram in 2015, unit in 10 Mt C (107 tons C).

 Final
