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Urbanization is one of the most consequential human activities on earth. The contradictions between urbanization and the eco-environment are particularly prominent in urban agglomerations with high industrial concentrations. Based on the Environmental Kuznets Curve (EKC) theory, we propose the hypothesis of the Urbanization-EKC (UEKC), which states that in the process of urbanization, eco-environmental quality first deteriorates and then improves, following a “U” trend. Taking 19 Chinese urban agglomerations as empirical cases, this paper analyzed the multi-dimensional coupling curves between urbanization and the eco-environment. The results show that the coupling curves between urbanization and the eco-environment are heterogeneous, as a result of differences among urban agglomerations and various eco-environmental indicators. In five mega-urban agglomerations, we found that the coupled curve of urbanization and eco-environmental quality index (EQI) is a compound function containing logarithm and quadratic terms, following the “U” curve shape of “quick down, slow up”; the turning point of EQI improvement was found at an urbanization rate of 47%. The empirical results validate that the UEKC hypothesis is tenable for developed urban agglomerations. This study provides a methodological reference for researching the evolutionary relationship between urbanization and the eco-environment and provides decision support for a more harmonious development of humans and nature in China's urban agglomerations.
Chuanglin Fang; Haimeng Liu; Shaojian Wang. The coupling curve between urbanization and the eco-environment: China’s urban agglomeration as a case study. Ecological Indicators 2021, 130, 108107 .
AMA StyleChuanglin Fang, Haimeng Liu, Shaojian Wang. The coupling curve between urbanization and the eco-environment: China’s urban agglomeration as a case study. Ecological Indicators. 2021; 130 ():108107.
Chicago/Turabian StyleChuanglin Fang; Haimeng Liu; Shaojian Wang. 2021. "The coupling curve between urbanization and the eco-environment: China’s urban agglomeration as a case study." Ecological Indicators 130, no. : 108107.
Although global total fossil fuel CO2 emissions continued to grow between 2005 and 2016, many developed countries had experienced a decline in their emissions in the past decade, which significantly slowing down the growth of global emissions. Understanding the determinants of emissions trends in economies with continuously decreasing emissions is key to gauging whether efforts to decarbonize heavy industry and energy systems is working. This study selected a “peak-and-decline” panel of 18 economies to carry out a decomposition analysis on CO2 emissions with six contributing factors using an extended STIRPAT model and estimated the future trend of their CO2 emissions from both historical and prospective perspectives. The results show that CO2 emissions and the six determining factors to be stationary after the first difference and to maintain a cointegrated relationship. The two-way fixed effect modeling analysis showed that the transition from fossil fuels to renewable energy and variations in energy intensity and fossil CO2 intensity were the primary factors contributed to the decrease in CO2 emissions. The Granger causality test reveals that there exists a bi-directional long-run causal link between the renewable energy consumption share and CO2 emissions, and an uni-directional short-run causal association from industrial structure, GDP per capita and energy intensity to CO2 emissions. Moreover, the forecasting results indicated that changes in the renewable energy share and fossil CO2 intensity will be the two primary factors for the decline inCO2 emissions in the next thirty years, while the contribution from the industrial structure, economic growth, and fossil energy intensity are rather limited. These findings highlight the importance of improved energy efficiency and the use of renewable energy in reducing CO2 emissions in the eighteen developed countries.
Rong Wu; Jieyu Wang; Shaojian Wang; Kuishuang Feng. The drivers of declining CO2 emissions trends in developed nations using an extended STIRPAT model: A historical and prospective analysis. Renewable and Sustainable Energy Reviews 2021, 149, 111328 .
AMA StyleRong Wu, Jieyu Wang, Shaojian Wang, Kuishuang Feng. The drivers of declining CO2 emissions trends in developed nations using an extended STIRPAT model: A historical and prospective analysis. Renewable and Sustainable Energy Reviews. 2021; 149 ():111328.
Chicago/Turabian StyleRong Wu; Jieyu Wang; Shaojian Wang; Kuishuang Feng. 2021. "The drivers of declining CO2 emissions trends in developed nations using an extended STIRPAT model: A historical and prospective analysis." Renewable and Sustainable Energy Reviews 149, no. : 111328.
Summary Rapid urbanization has tremendously changed the global landscape with profound impacts on our society. Nighttime light (NTL) data can provide valuable information about human activities and socioeconomic conditions thus has become an effective proxy to measure urban development. By using NTL-derived urban measures from 1992 to 2018, we analyzed the spatiotemporal patterns of global urban development from country to region to city scales, which presented a distinct North-South divergence characterized by the rising and declining patterns. A global North-South division line was identified to partition the globe into the Line-North and the Line-South geographically, which accorded with the socioeconomic difference from the aspects of urban population and economy. This line may keep a certain degree of stability deriving from the trends of population and economic information but also bears uncertainties in the long term.
Yatao Zhang; Xia Li; Shaojian Wang; Yao Yao; Qingquan Li; Wei Tu; Hongfang Zhao; Hui Zhao; Kuishuang Feng; Laixiang Sun; Klaus Hubacek. A global North-South division line for portraying urban development. iScience 2021, 24, 1 .
AMA StyleYatao Zhang, Xia Li, Shaojian Wang, Yao Yao, Qingquan Li, Wei Tu, Hongfang Zhao, Hui Zhao, Kuishuang Feng, Laixiang Sun, Klaus Hubacek. A global North-South division line for portraying urban development. iScience. 2021; 24 (7):1.
Chicago/Turabian StyleYatao Zhang; Xia Li; Shaojian Wang; Yao Yao; Qingquan Li; Wei Tu; Hongfang Zhao; Hui Zhao; Kuishuang Feng; Laixiang Sun; Klaus Hubacek. 2021. "A global North-South division line for portraying urban development." iScience 24, no. 7: 1.
Bulk terpolymerization of carbon dioxide and phthalic anhydride with propylene oxide is successfully carried out using metal-free and economical Lewis pairs under mild conditions. A series of commercial organic bases are coupled with triethyl borane (TEB) as Lewis pairs to optimize the activity and the results show that the TEB/ bis(triphenylphosphine)iminium chloride (PPNCl) pair exhibits relatively high activity and selectivity. The impact of the molar ratio of TEB to organic bases, reaction temperature and CO2 pressure as well as the catalyst loading on the activity and selectivity of the copolymerization are investigated. Particularly, the turnover frequency reaches 164 h−1 with a TEB/PPNCl molar ratio of 2/1 at 80 °C. To our delight, the poly(ester-co-carbonate)s with random or block structures can be simply tuned by choosing different organic bases coupled with TEB. In these cases, the resultant terpolymers with comprehensive properties can be readily synthesized. As expected, the incorporation of phthalic anhydride effectively modifies the thermal and mechanical properties of commercial poly(propylene carbonate) (PPC). Terpolymers named as PPC-P with 43 mol% aromatic polyester moieties displays a glass transition temperature (Tg) of 47 °C, about 9 °C higher than that of commercial PPC, and gives a tensile strength higher than 37.6 MPa. To our delight, the synthesized PPC-P exhibits satisfactory degradation speed under standard composting condition compared with commercial PBAT and PPC.
Jiaxin Liang; Shuxian Ye; Wenjing Wang; Congxiao Fan; Shuanjin Wang; Dongmei Han; Wei Liu; Yan Cui; Limin Hao; Min Xiao; Yuezhong Meng. Performance tailorable terpolymers synthesized from carbon dioxide, phthalic anhydride and propylene oxide using Lewis acid-base dual catalysts. Journal of CO2 Utilization 2021, 49, 101558 .
AMA StyleJiaxin Liang, Shuxian Ye, Wenjing Wang, Congxiao Fan, Shuanjin Wang, Dongmei Han, Wei Liu, Yan Cui, Limin Hao, Min Xiao, Yuezhong Meng. Performance tailorable terpolymers synthesized from carbon dioxide, phthalic anhydride and propylene oxide using Lewis acid-base dual catalysts. Journal of CO2 Utilization. 2021; 49 ():101558.
Chicago/Turabian StyleJiaxin Liang; Shuxian Ye; Wenjing Wang; Congxiao Fan; Shuanjin Wang; Dongmei Han; Wei Liu; Yan Cui; Limin Hao; Min Xiao; Yuezhong Meng. 2021. "Performance tailorable terpolymers synthesized from carbon dioxide, phthalic anhydride and propylene oxide using Lewis acid-base dual catalysts." Journal of CO2 Utilization 49, no. : 101558.
In the social context of enhancing environmental quality and mitigating climate change, the improvement of carbon emission efficiency has emerged as a hot topic recently due to its promise as an approach to reduce emissions and improve environmental quality. A large volume of studies has identified technological progress as a critical factor affecting energy efficiency and pollution emission levels. From the perspective of national differences, the contributions of our study lied in constructing a system to measure technological progress based on the outputs and transformations of a country's technical progress level. Secondly, this paper examined the direct effect of technological progress on carbon emission efficiency, and the interaction effect between technological progress and energy intensity on carbon emission efficiency. Thirdly, we taking into account differences in the effect that technological progress can have on carbon emission efficiency in different national contexts. For this purpose, we evaluated the carbon emission efficiency of 59 countries in the period 1998–2016 using a super-SBM model, subsequently employing a national panel quantile regression method to explore the multiple effects of technological progress on the carbon emission efficiency of countries with different levels of efficiency. Our main findings indicate that the national carbon emission efficiency steadily increased across the study period, albeit with slight fluctuations, and that generally countries' carbon emission efficiency still exists great potential of enhancement. Technological progress will drive carbon emission efficiency to improve significantly, while this effect varies between countries with different levels of efficiency. Further, the interaction effects of technological progress and energy intensity are shown to exert complex effects on carbon emission efficiency, providing evidence that scientific and technological achievements need to be converted into productivity in time to offset the negative environmental effects of pollution and emissions. Governmental departments should, as a result, strengthen environmental supervision and urge enterprises to eliminate backward production capacity, introduce new technologies, and improve energy efficiency. Countries may realize the development of low-carbon sustainable societies by transforming their economic growth mode and adopting energy-saving production techniques.
Zihan Xie; Rong Wu; Shaojian Wang. How technological progress affects the carbon emission efficiency? Evidence from national panel quantile regression. Journal of Cleaner Production 2021, 307, 127133 .
AMA StyleZihan Xie, Rong Wu, Shaojian Wang. How technological progress affects the carbon emission efficiency? Evidence from national panel quantile regression. Journal of Cleaner Production. 2021; 307 ():127133.
Chicago/Turabian StyleZihan Xie; Rong Wu; Shaojian Wang. 2021. "How technological progress affects the carbon emission efficiency? Evidence from national panel quantile regression." Journal of Cleaner Production 307, no. : 127133.
Understanding the spatiotemporal variety and influencing mechanisms of ecosystem service value (ESV) can provide a scientific guide for the regional ecological management and sustainable development. However, the joint effect of factors influencing ESV is ignored, which is an important way for influencing factors to work in the complex and frequently interacting ecosystem. In this study, we used remote sensing data, grid statistics data, and machine learning methods to reveal the spatiotemporal variation of ESV and to explore the combined effects of influencing factors in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) from 2000 to 2015. The specific results were as follows. (1) The total ESV in the GBA decreased by 13.11 billion yuan with the rate of decline slowing over the study period, and the regulating service suffered the most damage. (2) The spatial distribution of ESV has an outer high and inner low circle structure. Compared with that of the west bank of the Pearl River estuary, ESV of the east bank is relatively lower. (3) The three kinds of combination of factors had different impacts on ecosystem services. ①The effect of land-use integrity on ecosystem services is opposite between natural ecosystem and urban ecosystem. ②When regional population density is under a certain threshold (669 people/km2), social economies and ecosystems may develop together. ③The mismatched hydrothermal conditions can lead to a decrease in ESV. The findings of our study are conducive to identifying the current situation of ecosystem services and promoting the ecological civilization construction in the GBA, and bring a new insight and perspective on the influencing mechanisms of ESV.
Zhitao Liu; Rong Wu; Yongxin Chen; Chuanglin Fang; Shaojian Wang. Factors of ecosystem service values in a fast-developing region in China: Insights from the joint impacts of human activities and natural conditions. Journal of Cleaner Production 2021, 297, 126588 .
AMA StyleZhitao Liu, Rong Wu, Yongxin Chen, Chuanglin Fang, Shaojian Wang. Factors of ecosystem service values in a fast-developing region in China: Insights from the joint impacts of human activities and natural conditions. Journal of Cleaner Production. 2021; 297 ():126588.
Chicago/Turabian StyleZhitao Liu; Rong Wu; Yongxin Chen; Chuanglin Fang; Shaojian Wang. 2021. "Factors of ecosystem service values in a fast-developing region in China: Insights from the joint impacts of human activities and natural conditions." Journal of Cleaner Production 297, no. : 126588.
As a key component of direct methanol fuel cells, proton exchange membranes with suitable thickness and robust mechanical properties have attracted increasing attention. On the one hand, a thinner membrane gives a lower internal resistance, which contributes highly to the overall electrochemical performance of the cell, on the other hand, strong mechanical strength is required for the application of proton exchange membranes. In this work, a sulfonated poly (fluorenyl ether ketone) (SPFEK)-impregnated polyimide nanofiber mat composite membrane ([email protected]) was fabricated. The new composite membrane with a thickness of about 55 μm exhibited a tensile strength of 35.1 MPa in a hydrated state, which is about 65.8% higher than that of the pristine SPFEK membrane. The antioxidant stability test in Fenton’s reagent shows that the reinforced membrane affords better oxidation stability than does the pristine SPFEK membrane. Furthermore, the morphology, proton conductivity, methanol permeability, and fuel cell performance were carefully evaluated and discussed.
Geng Cheng; Zhen Li; Shan Ren; Dongmei Han; Min Xiao; Shuanjin Wang; Yuezhong Meng. A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application. Polymers 2021, 13, 523 .
AMA StyleGeng Cheng, Zhen Li, Shan Ren, Dongmei Han, Min Xiao, Shuanjin Wang, Yuezhong Meng. A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application. Polymers. 2021; 13 (4):523.
Chicago/Turabian StyleGeng Cheng; Zhen Li; Shan Ren; Dongmei Han; Min Xiao; Shuanjin Wang; Yuezhong Meng. 2021. "A Robust Composite Proton Exchange Membrane of Sulfonated Poly (Fluorenyl Ether Ketone) with an Electrospun Polyimide Mat for Direct Methanol Fuel Cells Application." Polymers 13, no. 4: 523.
High energy density lithium–sulfur (Li–S) batteries are regarded as the promising next-generation energy stroge devices. The thermal runaway (TR) issues posed by Li–S batteries have been less investigated, while they are critical for the practical application of Li–S batteries. Herein, we first evaluate the TR features of the 1.5 Ah Li–S pouch cell (LSPC) at various states of charge (SOC) using extended volume-accelerating rate calorimetry (EV-ARC). The specific heat capacity and thermodynamic parameters have been calculated from the recorded data. An intermittent pulse technique has been used to quantify the internal resistance of LSPC during the EV-ARC test. The heat sources in the TR processes of LSPC composed of different chemistries have been probed using EV-ARC and differential thermal analysis (DTA). Moreover, it takes as long as 15.7 min for LSPC with 100% SOC from the sharp drop of voltage to the instantaneous rise of temperature, while it takes 16 s for lithium ion pouch cell (LIPC). The experiment results indicate that the major heat source during TR may not be the internal short circuit but the redox reaction between cathode and anode, which can provide an important insight into the rational design of safe Li–S battery system.
Xueyan Huang; Min Xiao; Dongmei Han; Jianjun Xue; Shuanjin Wang; Yuezhong Meng. Thermal runaway features of lithium sulfur pouch cells at various states of charge evaluated by extended volume-accelerating rate calorimetry. Journal of Power Sources 2021, 489, 229503 .
AMA StyleXueyan Huang, Min Xiao, Dongmei Han, Jianjun Xue, Shuanjin Wang, Yuezhong Meng. Thermal runaway features of lithium sulfur pouch cells at various states of charge evaluated by extended volume-accelerating rate calorimetry. Journal of Power Sources. 2021; 489 ():229503.
Chicago/Turabian StyleXueyan Huang; Min Xiao; Dongmei Han; Jianjun Xue; Shuanjin Wang; Yuezhong Meng. 2021. "Thermal runaway features of lithium sulfur pouch cells at various states of charge evaluated by extended volume-accelerating rate calorimetry." Journal of Power Sources 489, no. : 229503.
In the present work, a semi-interpenetrating network (semi-IPN) high-temperature proton exchange membrane based on polyethyleneimine (PEI), epoxy resin (ER), and polybenzimidazole (PBI) was prepared and characterized, aiming at their future application in fuel cell devices. The physical properties of the semi-IPN membrane are characterized by thermogravimetric analysis (TGA) and tensile strength test. The results indicate that the as-prepared PEI-ER/PBI semi-IPN membranes possess excellent thermal stability and mechanical strength. After phosphoric acid (PA) doping treatment, the semi-IPN membranes show high proton conductivities. PA doping level and volume swelling ratio as well as proton conductivities of the semi-IPN membranes are found to be positively related to the PEI content. High proton conductivities of 3.9 ∽ 7.8 × 10 − 2 S c m − 1 are achieved at 160°C for these PA-doped PEI-ER/PBI series membranes. H2/O2 fuel cell assembled with PA-doped PEI-ER(1 : 2)/PBI membrane delivered a peak power density of 170 mW cm-2 at 160°C under anhydrous conditions.
Chao Meng; Sheng Huang; Dongmei Han; Shan Ren; Shuanjin Wang; Min Xiao. Semi-interpenetrating Network Membrane from Polyethyleneimine-Epoxy Resin and Polybenzimidazole for HT-PEM Fuel Cells. Advances in Polymer Technology 2020, 2020, 1 -8.
AMA StyleChao Meng, Sheng Huang, Dongmei Han, Shan Ren, Shuanjin Wang, Min Xiao. Semi-interpenetrating Network Membrane from Polyethyleneimine-Epoxy Resin and Polybenzimidazole for HT-PEM Fuel Cells. Advances in Polymer Technology. 2020; 2020 ():1-8.
Chicago/Turabian StyleChao Meng; Sheng Huang; Dongmei Han; Shan Ren; Shuanjin Wang; Min Xiao. 2020. "Semi-interpenetrating Network Membrane from Polyethyleneimine-Epoxy Resin and Polybenzimidazole for HT-PEM Fuel Cells." Advances in Polymer Technology 2020, no. : 1-8.
Poor mechanical property is a critical problem for phosphoric acid-doped high-temperature proton exchange membranes (HT-PEMs). In order to address this concern, in this work, a 3D network structural poly (aryl ether ketone)-polybenzimidazole (PAEK-cr-PBI) polymer electrolyte membrane was successfully synthesized through crosslinking reaction between poly (aryl ether ketone) with the pendant carboxyl group (PAEK-COOH) and amino-terminated polybenzimidazole (PBI-4NH2). PAEK-COOH with a poly (aryl ether ketone) backbone endows superior thermal, mechanical, and chemical stability, while PBI-4NH2 serves as both a proton conductor and a crosslinker with basic imidazole groups to absorb phosphoric acid. Moreover, the composite membrane of PAEK-cr-PBI blended with linear PBI ([email protected]) was also prepared. Both membranes with a proper phosphoric acid (PA) uptake exhibit an excellent proton conductivity of around 50 mS cm-1 at 170°C, which is comparable to that of the well-documented PA-doped PBI membrane. Furthermore, the PA-doped PAEK-cr-PBI membrane shows superior mechanical properties of 17 MPa compared with common PA-doped PBI. Based upon these encouraging results, the as-synthesized PAEK-cr-PBI gives a highly practical promise for its application in high-temperature proton exchange membrane fuel cells (HT-PEMFCs).
Junqiao Jiang; Erli Qu; Min Xiao; Dongmei Han; Shuanjin Wang; Yuezhong Meng. 3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells. Advances in Polymer Technology 2020, 2020, 1 -13.
AMA StyleJunqiao Jiang, Erli Qu, Min Xiao, Dongmei Han, Shuanjin Wang, Yuezhong Meng. 3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells. Advances in Polymer Technology. 2020; 2020 ():1-13.
Chicago/Turabian StyleJunqiao Jiang; Erli Qu; Min Xiao; Dongmei Han; Shuanjin Wang; Yuezhong Meng. 2020. "3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells." Advances in Polymer Technology 2020, no. : 1-13.
Here, we first propose a comprehensive evaluation method of lithium sulfur (Li-S) pouch cells safety performance, including nail penetration, impact, external short circuit and overcharge tests. Using high definition IR imaging combined with a temperature-voltage data acquisition system, XPS and SEM, careful analysis of the thermal and electrochemical behaviors, chemical compositions and evolution of electrode structure of Li-S pouch cells is performed. Furthermore, the failure mechanism of Li-S pouch cells has been proposed for the first time. Based on the mechanism, an important self-protection “insulated seal” and overcharge without triggering safety hazards in Li-S pouch cells are identifed and elucidated in detal. Meanwhile, a pivotal strategy to address thermal runaway in Li-S pouch cells under abuse conditions is proposed by designing and fabricating a thermally conductive separator accordingly. The as-made carbon coated (LA132-C) separator shows in-plane thermal conductivity of 8.43 W m−1 K−1, which is 228% of commercial separators. The practical application of the as-made separator is highlighted by evaluating Li-S pouch cell to meet the standards for all abuse tests and delivers a high capacity retention rate of 87.7% over 30 cycles at 0.05C under lean electrolyte condition (E/S = 4.3).
Xueyan Huang; Jianjun Xue; Min Xiao; Shuanjin Wang; Yuning Li; Shichao Zhang; Yuezhong Meng. Comprehensive evaluation of safety performance and failure mechanism analysis for lithium sulfur pouch cells. Energy Storage Materials 2020, 30, 87 -97.
AMA StyleXueyan Huang, Jianjun Xue, Min Xiao, Shuanjin Wang, Yuning Li, Shichao Zhang, Yuezhong Meng. Comprehensive evaluation of safety performance and failure mechanism analysis for lithium sulfur pouch cells. Energy Storage Materials. 2020; 30 ():87-97.
Chicago/Turabian StyleXueyan Huang; Jianjun Xue; Min Xiao; Shuanjin Wang; Yuning Li; Shichao Zhang; Yuezhong Meng. 2020. "Comprehensive evaluation of safety performance and failure mechanism analysis for lithium sulfur pouch cells." Energy Storage Materials 30, no. : 87-97.
Climate change resulting from CO2 emissions has become an important global environmental issue in recent years. Improving carbon emission performance is one way to reduce carbon emissions. Although carbon emission performance has been discussed at the national and industrial levels, city-level studies are lacking due to the limited availability of statistics on energy consumption. In this study, based on city-level remote sensing data on carbon emissions in China from 1992–2013, we used the slacks-based measure of super-efficiency to evaluate urban carbon emission performance. The traditional Markov probability transfer matrix and spatial Markov probability transfer matrix were constructed to explore the spatiotemporal evolution of urban carbon emission performance in China for the first time and predict long-term trends in carbon emission performance. The results show that urban carbon emission performance in China steadily increased during the study period with some fluctuations. However, the overall level of carbon emission performance remains low, indicating great potential for improvements in energy conservation and emission reduction. The spatial pattern of urban carbon emission performance in China can be described as “high in the south and low in the north,” and significant differences in carbon emission performance were found between cities. The spatial Markov probabilistic transfer matrix results indicate that the transfer of carbon emission performance in Chinese cities is stable, resulting in a “club convergence” phenomenon. Furthermore, neighborhood backgrounds play an important role in the transfer between carbon emission performance types. Based on the prediction of long-term trends in carbon emission performance, carbon emission performance is expected to improve gradually over time. Therefore, China should continue to strengthen research and development aimed at improving urban carbon emission performance and achieving the national energy conservation and emission reduction goals. Meanwhile, neighboring cities with different neighborhood backgrounds should pursue cooperative economic strategies that balance economic growth, energy conservation, and emission reductions to realize low-carbon construction and sustainable development.
Shaojian Wang; Shuang Gao; Yongyuan Huang; Chenyi Shi. Spatiotemporal evolution of urban carbon emission performance in China and prediction of future trends. Journal of Geographical Sciences 2020, 30, 757 -774.
AMA StyleShaojian Wang, Shuang Gao, Yongyuan Huang, Chenyi Shi. Spatiotemporal evolution of urban carbon emission performance in China and prediction of future trends. Journal of Geographical Sciences. 2020; 30 (5):757-774.
Chicago/Turabian StyleShaojian Wang; Shuang Gao; Yongyuan Huang; Chenyi Shi. 2020. "Spatiotemporal evolution of urban carbon emission performance in China and prediction of future trends." Journal of Geographical Sciences 30, no. 5: 757-774.
Eco-efficiency can effectively measure the relationship between economy, resources, environment, and development. Understanding eco-efficiency is of great practical significance for decision makers tasked with addressing and delivering sustainable socioeconomic development. Based on an “undesirable output Slacks-Based Measure models,” this study evaluated the eco-efficiency of 285 Chinese cities during the period 2004–2014, analyzing spatiotemporal dynamics and influencing factors using a Spatial Autocorrelation Panel Data Model. The main results are as follows: From the spatial perspective, eco-efficiency in Chinese cities generally evidenced an M-shaped trend (increasing-decreasing-increasing-decreasing), and imbalanced spatiotemporal dynamics. Furthermore, the urban eco-efficiency generally presented a distinct convergence of HH cluster and LL cluster clubs, with the latter being the most dominant. From the regional point of view, there existed a decreasing trend in the efficiencies of cities, from eastern China to central and western China. In addition, we identified significant differences in the eco-efficiency of different cities in China, and the coefficient of variation of eco-efficiency showed a general decrease. The results of our estimation of the factors affecting urban eco-efficiency showed that the economic development level, the industrial structure, import and export trade, and the information level all had significant positive influence, and local government expenditure, social retail sales of consumer goods, and infrastructure all had a negative effect on urban eco-efficiency. This paper puts forward numbers of suggestions for ways to promote social, ecological, and economic development in Chinese cities, based on our findings.
Qianqian Liu; Shaojian Wang; Bo Li; Wenzhong Zhang. Dynamics, differences, influencing factors of eco-efficiency in China: A spatiotemporal perspective analysis. Journal of Environmental Management 2020, 264, 110442 .
AMA StyleQianqian Liu, Shaojian Wang, Bo Li, Wenzhong Zhang. Dynamics, differences, influencing factors of eco-efficiency in China: A spatiotemporal perspective analysis. Journal of Environmental Management. 2020; 264 ():110442.
Chicago/Turabian StyleQianqian Liu; Shaojian Wang; Bo Li; Wenzhong Zhang. 2020. "Dynamics, differences, influencing factors of eco-efficiency in China: A spatiotemporal perspective analysis." Journal of Environmental Management 264, no. : 110442.
To tackle climate change, Chinese government has applied an array of mitigating measures to reduce CO2 emissions. During the 11th Five-year Plan, Chinese government set the emission reduction target policy to reduce energy consumption per unit of gross domestic product (GDP) by 20%. This paper attempts to estimate the effect of this emission reduction target policy on industrial performance from complexity perspective. The result shows more complex industrial structure is related to less coal consumption. In general, emission reduction target policy has a negative effect on the probability of branching into new industries and lower the productivity and profitability of a given industry. However, this negative effect is weaker for more complex industries. Only for industries with very high complexity, emission reduction target policy can improve the performance of an industry rather than exerting a negative effect. Our finding not only helps to design a more effective policy to achieve industrial development strategy, but also provides a potential way to achieve economic growth while reduce the emission of greenhouse gases at the same time.
Zhaoyingzi Dong; Wenqiang Chen; Shaojian Wang. Emission reduction target, complexity and industrial performance. Journal of Environmental Management 2020, 260, 110148 .
AMA StyleZhaoyingzi Dong, Wenqiang Chen, Shaojian Wang. Emission reduction target, complexity and industrial performance. Journal of Environmental Management. 2020; 260 ():110148.
Chicago/Turabian StyleZhaoyingzi Dong; Wenqiang Chen; Shaojian Wang. 2020. "Emission reduction target, complexity and industrial performance." Journal of Environmental Management 260, no. : 110148.
China is currently the world's largest energy consumer and, at the same time, a huge trading power. With the increasing complexity of production processes along global value chains (GVCs), it is of great significance to study the impact of GVC participation on energy intensity. By using production length to measure GVC participation, this study first calculates China's manufacturing industry's total average production length of GVC activities and its three segments: length of pure domestic production, length of traditional trade production, and production length of GVC activities. Next, this study explains the influence mechanisms of GVC participation on energy intensity, proposes three research hypotheses, and conducts econometric analyses to examine the influence of production length and its three segments on energy intensity for a sample of China's manufacturing sector from 2000 to 2014. The results indicate that the total average production length of GVC activities significantly affects energy intensity and presents an inverted U-shaped, non-linear relationship wherein China has passed the critical point. The interactions between the three segments of production length and energy intensity also present an inverted U-shaped, non-linear relationship, where the impacts of the pure domestic segment and the “traditional” trade related segment on energy intensity have passed the critical point, while that of the segment related to GVC production has not yet crossed the critical point. It is suggested that further promoting China's manufacturing industry towards the mid-to-high end of the GVCs and breaking through its captive and “squeezed” position in the GVCs could significantly contribute toward curtailing energy intensity.
Lafang Wang; Youfu Yue; Rui Xie; Shaojian Wang. How global value chain participation affects China's energy intensity. Journal of Environmental Management 2020, 260, 110041 .
AMA StyleLafang Wang, Youfu Yue, Rui Xie, Shaojian Wang. How global value chain participation affects China's energy intensity. Journal of Environmental Management. 2020; 260 ():110041.
Chicago/Turabian StyleLafang Wang; Youfu Yue; Rui Xie; Shaojian Wang. 2020. "How global value chain participation affects China's energy intensity." Journal of Environmental Management 260, no. : 110041.
The global urbanization rate is accelerating; however, data limitations have far prevented robust estimations of either global urban expansion or its effects on terrestrial net primary productivity (NPP). Here, using a high resolution dataset of global land use/cover (GlobeLand30), we show that global urban areas expanded by an average of 5694 km2 per year between 2000 and 2010. The rapid urban expansion in the past decade has in turn reduced global terrestrial NPP, with a net loss of 22.4 Tg Carbon per year (Tg C year−1). Although small compared to total terrestrial NPP and fossil fuel carbon emissions worldwide, the urbanization-induced decrease in NPP offset 30% of the climate-driven increase (73.6 Tg C year−1) over the same period. Our findings highlight the urgent need for global strategies to address urban expansion, enhance natural carbon sinks, and increase agricultural productivity.
Xiaoping Liu; Fengsong Pei; Youyue Wen; Xia Li; Shaojian Wang; Changjiang Wu; Yiling Cai; Jianguo Wu; Jun Chen; Kuishuang Feng; Junguo Liu; Klaus Hubacek; Steven J. Davis; Wenping Yuan; Le Yu; Zhu Liu. Global urban expansion offsets climate-driven increases in terrestrial net primary productivity. Nature Communications 2019, 10, 1 -8.
AMA StyleXiaoping Liu, Fengsong Pei, Youyue Wen, Xia Li, Shaojian Wang, Changjiang Wu, Yiling Cai, Jianguo Wu, Jun Chen, Kuishuang Feng, Junguo Liu, Klaus Hubacek, Steven J. Davis, Wenping Yuan, Le Yu, Zhu Liu. Global urban expansion offsets climate-driven increases in terrestrial net primary productivity. Nature Communications. 2019; 10 (1):1-8.
Chicago/Turabian StyleXiaoping Liu; Fengsong Pei; Youyue Wen; Xia Li; Shaojian Wang; Changjiang Wu; Yiling Cai; Jianguo Wu; Jun Chen; Kuishuang Feng; Junguo Liu; Klaus Hubacek; Steven J. Davis; Wenping Yuan; Le Yu; Zhu Liu. 2019. "Global urban expansion offsets climate-driven increases in terrestrial net primary productivity." Nature Communications 10, no. 1: 1-8.
While many studies find that air pollution has been generally related with natural factors and anthropogenic activities, relatively little attention has been paid to exploring the impact of urban spatial structure on air pollution. This paper investigates the relationship between urban spatial structure and PM2.5 concentrations by drawing upon a panel dataset covering 286 Chinese cities during the 2001–2016 period. We measure two dimensions of urban spatial structure by using the LandScan High Resolution Global Population Dataset. The polycentricity-monocentricity dimension reflects to what extent population is distributed in a single center or across a number of subcenters. The concentration-dispersion dimension represents to what extent population is clustered in urban centers. By controlling for per capita GDP, population density, and the employment share of the secondary industry, our empirical results based on two-way fixed panel regression models find positive relationships between polycentricity, dispersion, and PM2.5 concentrations of Chinese cities. Other things being equal, an increase in the degrees of polycentricity and dispersion by 0.1 would lead to a rise in PM2.5 concentration by 0.1996 μg/m3 and 0.4063 μg/m3 respectively. Moreover, we find that the impact of polycentricity on PM2.5 concentrations is heterogeneous across cities. For cities with higher per capita GDP (>5200 US$) or a higher employment share of the secondary industry (>55.37%), a polycentric distribution of population is also expected to reduce PM2.5 concentrations. The results suggest that the planning of polycentric urban structure pursued by many Chinese local governments should be cautiously rethought.
Yingcheng Li; Kai Zhu; Shaojian Wang. Polycentric and dispersed population distribution increases PM2.5 concentrations: Evidence from 286 Chinese cities, 2001–2016. Journal of Cleaner Production 2019, 248, 119202 .
AMA StyleYingcheng Li, Kai Zhu, Shaojian Wang. Polycentric and dispersed population distribution increases PM2.5 concentrations: Evidence from 286 Chinese cities, 2001–2016. Journal of Cleaner Production. 2019; 248 ():119202.
Chicago/Turabian StyleYingcheng Li; Kai Zhu; Shaojian Wang. 2019. "Polycentric and dispersed population distribution increases PM2.5 concentrations: Evidence from 286 Chinese cities, 2001–2016." Journal of Cleaner Production 248, no. : 119202.
Jieyu Wang; Shaojian Wang; Shijie Li; Kuishuang Feng. Coupling analysis of urbanization and energy-environment efficiency: Evidence from Guangdong province. Applied Energy 2019, 254, 1 .
AMA StyleJieyu Wang, Shaojian Wang, Shijie Li, Kuishuang Feng. Coupling analysis of urbanization and energy-environment efficiency: Evidence from Guangdong province. Applied Energy. 2019; 254 ():1.
Chicago/Turabian StyleJieyu Wang; Shaojian Wang; Shijie Li; Kuishuang Feng. 2019. "Coupling analysis of urbanization and energy-environment efficiency: Evidence from Guangdong province." Applied Energy 254, no. : 1.
Technological progress is widely considered to play an important role in reducing air pollution. While growing literature has explored the effects of technological progress on environmental quality, fewer studies have considered the varied effects exerted by different technological progress paths on PM2.5 concentrations. This paper explored the relationship between two different kinds of technological progress (indigenous innovation and technology diffusion) and PM2.5 concentrations. Indigenous innovation was in this study considered to be composed by research and development investment (R&D) and import technology (IM); technology diffusion was represented by foreign direction investment (FDI) and export learning effect represent (EX). A panel data model was employed in order to explore the varied impact of these different technological progress paths on PM2.5 concentrations, using data for 48 cities located in China's three most developed urban agglomerations (Beijing-Tianjin-Hebei, the Yangtze River Delta, and the Pearl River Delta), for the period 2000-2015. The results reveal that without control variables, FDI had a significant negative impact on PM2.5 levels in Beijing-Tianjin-Hebei, and EX a significant positive impact. FDI, R&D, and EX were found to positively correlate with PM2.5 levels in the Yangtze River Delta. In Pearl River Delta, R&D presented a significant negative relationship. The findings of this study provide decision makers and industry managers with a scientific basis from which to approach the task of mitigating PM2.5 concentrations through technological progress.
Jing Chen; Shaojian Wang; Chunshan Zhou; Ming Li. Does the path of technological progress matter in mitigating China's PM2.5 concentrations? Evidence from three urban agglomerations in China. Environmental Pollution 2019, 254, 113012 .
AMA StyleJing Chen, Shaojian Wang, Chunshan Zhou, Ming Li. Does the path of technological progress matter in mitigating China's PM2.5 concentrations? Evidence from three urban agglomerations in China. Environmental Pollution. 2019; 254 ():113012.
Chicago/Turabian StyleJing Chen; Shaojian Wang; Chunshan Zhou; Ming Li. 2019. "Does the path of technological progress matter in mitigating China's PM2.5 concentrations? Evidence from three urban agglomerations in China." Environmental Pollution 254, no. : 113012.
While urbanization has boosted the global economy, it is putting increasing pressure on air quality. Previous studies on the link between urbanization and air pollution have tended to focus on individual aspects of urbanization. In addition, research into the global scale has been scarce. This study constructed an urbanization index system integrating demographic, spatial, economic, and social components and divided 190 countries into 4 subpanels according to the national income levels, in order to identify the heterogeneity effects of urbanization on PM2.5 pollutants for the period 1998–2014 from a global perspective. The results of the panel regression models prove that the effect of urbanization on atmospheric contamination varied significantly across the income-based subpanels. The model analysis shows that demographic urbanization has a significant positive effect on PM2.5 concentrations in all subpanels. Spatial urbanization had exerted a negative effect on air pollution in high-income countries and a positive influence on air pollution in other countries. Social urbanization, in contrast, presented the opposite trend. Additionally, the model analysis shows that the economic urbanization in upper-middle-income and high-income groups can effectively alleviate PM2.5 pollutants. This study indicated that the level of development needs to be taken into account when government policy makers formulate targeted measures to control haze and improve air quality.
Shaojian Wang; Shuang Gao; Shijie Li; Kuishuang Feng. Strategizing the relation between urbanization and air pollution: Empirical evidence from global countries. Journal of Cleaner Production 2019, 243, 118615 .
AMA StyleShaojian Wang, Shuang Gao, Shijie Li, Kuishuang Feng. Strategizing the relation between urbanization and air pollution: Empirical evidence from global countries. Journal of Cleaner Production. 2019; 243 ():118615.
Chicago/Turabian StyleShaojian Wang; Shuang Gao; Shijie Li; Kuishuang Feng. 2019. "Strategizing the relation between urbanization and air pollution: Empirical evidence from global countries." Journal of Cleaner Production 243, no. : 118615.