Based on the double-carbon target, the agricultural sector has implemented the concept of being green and synergistically promoted pollution and carbon reduction. Positioned as a novel financial paradigm, green finance places greater emphasis on environmental stewardship compared to its traditional counterparts. This focus enhances resource allocation efficiency, thereby achieving the goal of reducing pollution and carbon emissions. To research the influence of green finance on agricultural pollution and carbon reduction, this study leverages panel data spanning 2011 to 2021 from 31 provinces, autonomous regions, and municipalities across China. It employs the fixed-effect model and mediating-effect model. The findings reveal that: (1) Green finance exerts a notable influence on reducing both pollution and carbon emissions in agriculture, with the latter showing a more pronounced effect. (2) Regional disparities exist in green finance, affecting agricultural pollution and carbon reduction. (3) By fostering technological innovation and optimizing industrial frameworks, green finance emerges as a catalyst for curbing surface pollution and carbon dioxide emissions in agriculture. On this basis, relevant suggestions are put forward to provide policy insights for improving the green financial system, which will help further promote carbon and pollution reduction.

While China’s outward foreign direct investment (OFDI) is growing rapidly, few studies have considered the impact of this growth on product quality. This study uses microdata at the enterprise level to investigate the effects of OFDI on product quality and export trade, from the perspective of enterprise heterogeneity. The results denote that (1) OFDI improves product quality, which is caused by the direct promotional effect of OFDI and the productivity effect brought by OFDI. (2) As OFDI of low productivity enterprises creates a productivity effect and leads to a promotional effect on product quality enhancement, the magnitude is significantly higher than that of high productivity enterprises. (3) Product quality enhancement significantly increases the promotional effect on exports induced by OFDI of low productivity enterprises, while simultaneously significantly suppressing the promotional effect on exports induced by OFDI of high productivity enterprises. (4) The promotional effect of OFDI on exports decreases as productivity increases, and OFDI significantly promotes exports of low productivity enterprises and has no significant effect on high productivity enterprises. These results suggest that China should continue to expand the space for international cooperation and encourage enterprises to invest overseas, especially those facing export pressures.

Based on the control process and requirements of the industrialized recirculating aquaculture system (IRAS), we designed an aquaculture automatic control system. The entire system is divided into seven modules including water circulation and filtration, bioreactor self-loop, water quality monitoring, Emergency treatment, thermostatic temperature control, PID operation, and failure alarm. It is used to control the water circulation, and automatically detect and adjust the environmental factors of the pond for best farming environment. The lower computer adopts Siemens S7-200 PLC. MCGS configuration software is applied in the upper computer for the dynamic display, parameter setting, fault alarm and other functions of the whole recirculating aquaculture process. The lab test showed the advantages of the system including the high degree of automation of the system, user-friendly, easy to maintain and reliable operation, with a good promotional and application value.