Search

The sixth Coupled Model Intercomparison Project (CMIP6) scenarios provide opportunities to explore global climate and pollution mitigation pathways with socioeconomic features, but they might be limited on regional-scale projections due to inadequate consideration of local policies. Here, we simulated China's PM2.5 air quality with local policy-based scenarios (Dynamic Projection for Emissions in China (DPEC)) and the CMIP6 scenarios. We found both emission inventories can reproduce China's base-year PM2.5 and chemical aerosols while using DPEC emissions could better match in-situ observations. In addition, DPEC mitigation scenarios can better capture China's PM2.5 decline during 2015-2019 (22% under SSP2-45-policy and 30% under SSP1-26-best) with observations (~28%) than CMIP6 emissions. With the effects of current-year bias and inadequate considerations of pollution control policies, PM2.5 projections in 2030 and 2050 with CMIP6 mitigation scenarios are 42%-48% (9-13 µg/m3) and 59%-73% (8-12 µg/m3) higher than projections with DEPC. Our study suggests the community should incorporate more region-specific environmental policy in future scenario designs. Plain Language Summary Global emission scenarios might be limited on regional-scale air quality projections because of inadequate consideration of local environmental policy. Here, we simulated China's air quality variations through 2050 with global emission data sets and local policy-based emission scenarios. Both global and local emissions can reasonably estimate China's air quality; however, estimations with local emission scenarios are more correlated with surface observations and can better capture China's rapid air quality improvement during 2015-2019. Local policy deficiencies and current year bias further make future air quality projections driven by global emission scenarios 42%-73% higher than driven by local policy-based scenarios. Our findings could offer insights for the research community to incorporate more detailed regional information in future global scenario designs, which might help to better investigate the climate change impacts and improve global scenario applicability to regional scales. [ABSTRACT FROM AUTHOR]

Stockbreeding industries are increasing rapidly in rural areas around big cities in China. This increase carries high risks to the environment due to emissions of large amounts of water pollutants and greenhouse gases. On the other hand, stockbreeding wastes are a typical biomass resource and can be used as an energy source by advanced technologies. In this study, we selected Miyun County and focused on analysing the synthetic environmental policies as endogenous variables by computer simulation including the introduction of advanced technologies to improve the environment and provide more biomass energy. The model considered both the total ecological system and the socio-economic situational changes. The purpose of our research is to establish effective utilization methods for biomass resources as well as co-ordinate resource reutilization, environmental preservation and economic development, and finally realize sustainable development of the society. [ABSTRACT FROM AUTHOR]

The article focuses on land restoration measures carried out in China. Land resources have not properly developed owing to the pressure from population growth and other socioeconomic problems. Land resources are utilized to ensure that the type of land used is related to the ecological characteristics of the area. Control measure appropriate to local conditions are adopted where desertification has developed. A large scale shelter belt system known as the "Green Wall of China" has been constructed to mitigate and hold back desertification.