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The role of public-private partnership investment and eco-innovation in environmental abatement in USA: evidence from quantile ARDL approach
Authors: Nguyen Van Song1 & Nguyen Cong Tiep1 & Dinh van Tien2 & Thai Van Ha2 & Nguyen Thi Minh Phuong3 & Tran Thi Hoang Mai3
358    2
Environmental Science and Pollution Research
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Publishing year: 9/2021
The current research investigates the role of public-private partnership investment (PPPI) and ecological innovation (ECO) along with economic growth on the environmental abatement (i.e., carbon dioxide emission, particulate matters 2.5) in the USA. Quantile autoregressive lagged (QARDL) method was employed during the study period of 1990–2015. The study findings confirm that under long-run estimation, GDP and PPPI are causing more environmental abatement in the form of CO2 emission and haze pollution like PM2.5. The factors like ecological innovation and GDP2 are playing their role towards lowering the CO2 emission and PM2.5 under different quantiles. Furthermore, it is observed that under short-run estimation, past values of the carbon emissions and PM2.5 have their significant and positive relationship with their current values. Besides, the findings through Wald test estimation confirm that parameter constancy of the speed of adjustment parameter is rejected at 1% significance level for the CO2 emission and haze pollution like PM2.5 in USA. Besides, present study also provides some policy implications.
Ecological innovation . Public-private partnership investment . GDP . QARDL
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