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Tracking China's national and regional CO2 emission trends is becoming ever more crucial. The country recently pledged to achieve ambitious emissions reduction targets, however, high-resolution datasets for provincial level CO2 emissions in China are still lacking. This study provides daily CO2 emission datasets for China's 31 provinces, including for the first time, the province of Tibet. The inventory covers the emissions from three industrial sectors (power, industry and ground transport) during 2019 to 2020, with its temporal resolution at a daily level. In addition, the variations in CO2 emissions for seasonal, weekly and holiday periods have been uncovered at a provincial level for the first time. This new data was added to further analyze the impact that weekends and holidays have on China's CO2 emissions. Over weekend periods, carbon emissions are shown to reduce by around 3%. Spring Festival meanwhile, has the greatest impact on the reduction of China's CO2 emissions. This detailed and time-related inventory will facilitate a more local and adaptive management of China’s CO2 emissions during both the COVID-19 pandemic’s recovery and the ongoing energy transition. The data are archived at https://doi.org/10.5281/zenodo.4730175 (Cui et al., 2021). [ABSTRACT FROM AUTHOR]

The production, supply and distribution of energy and water resources in cities have become a hot topic in recent years. Confronted with increasing challenges of both water scarcity and energy security, collaborative management of energy and water resources from the nexus perspective can provide a new way to solve the interwoven problems. This study aims to develop a conceptual framework to model the energy-water nexus at urban scale. The model is a combination of material flow analysis (MFA) and input-output analysis (IOA), which can revalue the interrelation between energy and water in a holistic and coupling vision. We also investigate the possible existence of dynamic causality between energy consumption and water consumption in Beijing. The Granger causality analysis is employed to test the causality relationships among energy and water uses beneath the urban economic sectors. The results indicate that uni-directional causality exists in the urban energy-water nexus, beneath which there are long-period interrelations. Then, scenario analysis is conducted to find out the influences of different management suggestions. According to existing national water and energy polices, three types of interventions (S1, S2, and S3) are designated and compared to determine the effectiveness of certain mitigation strategies. [ABSTRACT FROM AUTHOR]