School of Management and Economics, Beijing Institute of Technology, 100081, Beijing, China.
Department of Management Sciences, Bahria University, Islamabad, Pakistan.
Environ Sci Pollut Res Int. 2022 Jun;29(29):44020-44041. doi: 10.1007/s11356-022-18904-w. Epub 2022 Feb 5.
This study investigates the heterogeneous impact of air transport intensity, air passenger transport, and air freight transport on air transport carbon emissions in G20 countries for the period of 1990-2016. The paper employs a robust and advanced fixed-effect panel quantile regression model that considers unobserved discrete and distributional heterogeneity. Our empirical results show that the impact of the independent variables on air transport carbon emissions is quite heterogeneous across various quantiles. More specifically, the effect of air transport intensity, air passenger transport, and air freight transport on carbon emissions is positive and becomes more assertive with the increasing trend at upper quantiles and is quite heterogeneous across all quantiles. Economic growth, urbanization, and tourism are significant contributing factors in enhancing air transport CO emissions, while crude oil price significantly reduces CO emissions. The Dumitrescu and Hurlin causality test estimates indicate that a bidirectional relationship extends from air transport intensity, air passenger transport, and air freight transport to air transport CO emissions. The findings underline the need for cleaner, renewable, and environmentally sustainable energy sources for air transport operations.
本研究考察了 1990-2016 年间，二十国集团（G20）国家航空运输强度、航空旅客运输和航空货运对航空运输碳排放的异质影响。本文采用稳健和先进的固定效应面板分位数回归模型，考虑了未观测到的离散和分布异质性。我们的实证结果表明，各变量对航空运输碳排放的影响在不同分位数之间存在很大的异质性。具体而言，航空运输强度、航空旅客运输和航空货运对碳排放的影响是正向的，并且随着上四分位数的上升趋势变得更加显著，而且在所有分位数上都存在很大的异质性。经济增长、城市化和旅游业是增加航空运输 CO 排放的重要因素，而原油价格则显著降低了 CO 排放。杜米特雷斯库和胡林因果关系检验估计表明，从航空运输强度、航空旅客运输和航空货运到航空运输 CO 排放的双向关系得以延伸。这些发现强调了航空运输运营需要更清洁、可再生和环境可持续的能源。
