The JAXA/GOSAT GHG product for tracking city-level emission changes

（Japanese title: GOSAT・都市レベル温室効果ガス排出量のトラッキング）

This submission provides our input for the first Global Stocktake under the Paris Agreement. Our input focuses on tracking city-level emission changes by the JAXA/GOSAT GHG product.

Summary of the submission:

• Cities are major sources of GHG emissions, consuming about 75% of the world’s energy and producing 70% of global carbon emissions. Monitoring trends of emissions can help cities identify emission sources to more effectively achieve their pledges.
• JAXA developed the space-based surface GHG Emission Indicator (GEI) for tracking emission changes at key subnational policy-relevant levels, such as cities. JAXA’s GEI is based on the difference between the upper and lower-tropospheric CO₂ and CH₄ concentrations.
• Of the six-year CO₂ emission trends for the Greater Tokyo Area, the GEI indicates a large emission reduction in 2020, attributed to the significantly reduced economic activities during the COVID-19 pandemic.
• GEI is available from the JAXA/GOSAT GHG product. JAXA also plans to release a CH₄ version of GEI to contribute toward local climate mitigation pledges.