Decomposition of driving factors and analysis of spatio-temporal differences of financial environmental expenditure performance

In order to clarify what factors affect the performance of government fiscal environmental protection expenditure from the perspective of “carbon peaking and carbon neutrality” target, and to seek a key path to improve the performance of government fiscal environmental protection expenditure, this paper takes three provinces and one city in the Yangtze River Delta as an example, based on the LMDI model, the environmental protection expenditure performance is decomposed into eight driving factors in three dimensions. The research shows that fiscal environmental protection expenditure effectively promotes regional green development; the fiscal pressure dimension and social development dimension promoted the environmental protection expenditure performance, while the R&D innovation dimension inhibited the regional environmental protection expenditure performance. Among the eight driving factors considered, the effect of fiscal pressure on environmental protection has the strongest promoting effect on environmental protection expenditure performance, and the effect of R&D scale has the strongest inhibiting effect on environmental expenditure performance. At the same time, the temporal evolution trend and spatial characteristics of each factor are significantly different