Research Article
The Impact of Green R&D Activities on SO2 Emissions: Evidence from China
Table 6
The nonlinear effect of green R&D activities on SO2 emissions.
| | Threshold variable | Independent variable | Threshold value | Variable | Coefficient | Threshold value | Variable | Coefficient | Threshold value | Variable | Coefficient | Threshold value | Variable | Coefficient |
| | FEP | ln GRD | γ < 1.866 | ln GRD | −0.021 | 1.866 < γ < 3.087 | ln GRD | −0.063∗∗∗ | 3.087 < γ < 9.435 | ln GRD | −0.093∗∗∗ | 9.435 < γ | ln GRD | −0.128∗∗∗ | | ln UGRD | γ < 1.866 | ln UGRD | −0.008 | 1.866 < γ < 3.087 | ln UGRD | −0.063∗∗ | 3.087 < γ < 9.435 | ln UGRD | −0.100∗∗∗ | 9.435 < γ | ln UGRD | −0.136∗∗∗ | | ln CGRD | −0.021 | ln CGRD | −0.021 | ln CGRD | −0.021 | ln CGRD | −0.021 | | ln CGRD | γ < 1.866 | ln UGRD | −0.055∗ | 1.866 < γ < 3.331 | ln UGRD | −0.055∗∗ | 3.331 < γ < 9.435 | ln UGRD | −0.055∗∗ | 9.435 < γ | ln UGRD | −0.055∗ | | ln CGRD | 0.014 | ln CGRD | −0.031 | ln CGRD | −0.063∗∗ | ln CGRD | −0.100∗∗∗ |
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