Abstract
High-precision CO2 emission data by sector are of great significance for formulating CO2 emission reduction plans. This study decomposes low-precision energy consumption data from China into 149 sectors according to the high-precision input–output (I–O) table for 2017. An economic I–O life cycle assessment model, incorporating sensitivity analysis, is constructed to analyze the distribution characteristics of CO2 emissions among sectors. Considering production, the electricity/heat production and supply sector contributed the most (51.20%) to the total direct CO2 emissions. The top 10 sectors with the highest direct CO2 emissions accounted for >80% of the total CO2 emissions. From a demand-based perspective, the top 13 sectors with the highest CO2 emissions emitted 5171.14 Mt CO2 (59.78% of the total), primarily as indirect emissions; in particular, the housing construction sector contributed 23.97% of the total. Based on these results, promoting decarbonization of the power industry and improving energy and raw material utilization efficiencies of other production sectors are the primary emission reduction measures. Compared with low-precision models, our model can improve the precision and accuracy of analysis results and more effectively guide the formulation of emission reduction policies.
Highlights
With increasing global climate change, the reduction of carbon emissions whose major source is energy combustion [1] has become the focus of all countries
CO2 emission of 7061.11 Mt, which accounted for 81.62% of the total CO2 emissions from all sectors
As most of the CO2 emissions were generated from these 10 sectors, from a production-based perspective, emission reduction policies should focus on the production practices of them to control the corresponding direct CO2 emissions
Summary
With increasing global climate change, the reduction of carbon emissions whose major source is energy combustion [1] has become the focus of all countries. In 2019, China had the highest carbon emissions accounting for approximately 27.9% of global carbon emissions [2]. It is important to reduce the country’s emissions in order to contribute to global climate change mitigation. In September 2020, China proposed to achieve peak CO2 emissions by 2030 and carbon neutrality by 2060. To facilitate formulation of emission reduction plans, it is necessary to study China’s carbon emissions from energy combustion based on a higher sector resolution. The aggregation and decomposition of emission sectors are important aspects of research on CO2 emissions mitigation. The classification of sectors in the China Energy
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