Achieving the “dual carbon” objective is contingent upon the ecological development of agriculture. As the only Science and Technology City in China, evaluating the level of green agricultural development in Mianyang during the 13th Five-Year Plan is of considerable practical importance. Using the entropy weight comprehensive evaluation method, this paper determines the level of green agricultural development in Mianyang by selecting panel data from 2016 to 2020 for Mianyang and its counties (cities and districts) and constructing 15 agricultural green development evaluation indicators from three levels: socioeconomic, scientific and technological progress, and resources and environment. The results indicate that the overall level of green agricultural development in the city of Mianyang is satisfactory, and that the level of green development increased each year from 2016 to 2020, with clear differences in the level of green agricultural development between counties (cities and districts) and numerous factors influencing the development of green agriculture. On this basis, it is proposed that local conditions-specific green agricultural development policies be formulated and implemented in accordance with local conditions to promote the ecological and high-quality development of agriculture by capitalizing on the benefits of a science and technology city, and to assist in achieving the “dual carbon” objective.

Food security is a goal and means of global sustainable development, and an important component of China’s national security. Based on grain production data from 2000 to 2020, 31 provinces (cities, autonomous regions) in China were used as research units to analyze the spatiotemporal differences and driving forces of grain production in China using a combination of local correlation index, center of gravity transfer model, and geographic detector. The results as follows, ① During the research period, China’s total grain production showed a decrease followed by an increase, and the yield per unit area of grain showed an increasing trend. Corn has become the "largest staple food" in China; ② During the research period, the focus of China’s grain production continued to shift northward, with Heilongjiang, Henan and Shandong provinces becoming the main grain production areas, with Henan being the province where China’s grain production center was located. Among the factors affecting grain yield, the effective irrigation area (0.971) has the strongest explanatory power. Finally, countermeasures and suggestions were proposed from five aspects, stabilizing grain production, reducing grain inventory pressure, implementing regional grain security responsibilities, improving grain circulation efficiency, promoting high-quality grain engineering construction, adjusting grain production structure, strictly implementing farmland protection responsibilities, scientifically applying pesticides, fertilizers and other production materials, emphasizing agricultural infrastructure construction and stabilizing the number of agricultural labor force.