The United States and China on the paths and policies to carbon neutrality.

The rapid economic development has highlighted the global climate change problem and carbon dioxide emissions have brought challenges to global climate change. The combined carbon emissions of the United States and China are nearly half of global carbon emissions. These two countries have made great contributions to environmental protection and responded actively to global warming, and set the goal of carbon neutrality. This study takes the United States and China as examples to compare their national paths and policies to achieve carbon neutrality while also analyzing the stage effects of carbon emission reduction in these two countries. This study found that the policy systems in the United States and China are opposites of each other. The United States is a "Bottom to Top" system while China is a "Top to Bottom". The CO2 emission in the United States is currently in the absolute carbon emission reduction period, that is, the reduction of total carbon emissions; while China is in the relative carbon emission reduction period, that is, the reduction of carbon emission intensity. China's transition time from carbon peaking to carbon neutrality is shorter than that of the United States, which is a huge challenge for China because its population is much larger than that of the United States. The results of this research can be used by other countries and regions for supporting carbon reduction policy decision-making and achieving UN sustainable development goals (SDGs).

Place-specific product relatedness and the environmental performance of non-polluting exports in China.

Does the growth of non-polluting exports lead to better environmental performance? The answer depends on how these exports rest on local comparative advantages. The more exports rely on polluting inputs, the worse their environmental performance would be. In practice, it is difficult to directly measure the polluting inputs for exporting products at the local level. This study proposes an approach to measure the reliance of exports on local polluting inputs, based on the product relatedness theories and the resource-based view of firms. This approach applies the locational quotient to indicate local resource advantages. Then, it uses the co-occurrence probability to measure the product relatedness of one export to local resource advantages. Finally, it distinguishes the product relatedness to polluting resource advantages from non-polluting ones. A higher level of polluting product relatedness is expected to depress the environmental performance of exports. Using 30 sectors in 281 Chinese cities as a case, this study applies the fixed effect model and the threshold regression model to examine the effects of product relatedness on environmental performance. Empirical results support the efficiency of using product relatedness to predict the environmental performance of exports. A higher level of polluting product relatedness leads to poorer environmental performance and more adverse effects of export growth on the environment.

Spatial Analysis of Citizens' Environmental Complaints in China: Implications in Environmental Monitoring and Governance.

Citizen environmental complaints play a key role in China's current environmental monitoring network and environmental governance system. Based on 5796 cases of environmental complaints lodged by citizens via hotline and the internet to the MEP of China, we examined the spatial characteristics and influencing factors of citizen complaints for the period of 2013-2017 using spatial analysis methods and spatial econometric models. The roles of citizen complaints in the two systems were then reevaluated. The results show that, among all cases, 75.88% of cases were identified as verified complaints, while nearly a 25% noisy rate directed large amounts of inspection resources to be utilized in response to nonverified cases. Air pollution received the most attention by citizens in China, accounting for 67.22% of total cases. The hotspots of citizen complaints were mostly distributed in the three major national urban agglomerations in China. We found that industrial wastewater and SO2 were positively associated with the likelihood of citizens filing complaints, while the effect of industrial soot/dust emission was insignificant. Citizen complaints might be triggered by certain, but not all, forms of pollutants, even though highly visible particulate pollutants did not necessarily induce corresponding complaints. Moreover, the negative relationship between citizen complaints and per capita GDP revealed the unbalanced geographical pattern between economical development and environmental quality. The proliferation of the internet greatly facilitated citizens lodging complaints through various ways. The synergy mechanism between citizen environmental complaints and other parts in China's environmental monitoring and governance system should be established in the future.