## 3 Result Analysis  
### Time Differences Analysis  
#### 3.1.1 Time Differences Analysis Based on Stage Division  
First, this article analyzes trends in public concern about food waste (see Figure 1). As can be seen from the data of the line chart, the public has been paying attention to the issue of food waste in recent years. On 11 August 2020, public concern about this topic increased significantly when release-type communication to stop food waste appeared. Next, this paper analyzes the public attitude tendency after release-type communication. The time series of comments is obtained by counting the number of comments on a scale of three natural days (see Figure 1). From the column chart data, it can be found that although the public concern lasts for a long time, the number of comments on Weibo is not continuous or even interrupts. On the other hand, the column chart data show multiple peaks in the number of public comments. We borrowed [PERSON] et al. 's [43] idea of dividing public opinion stages: When the number of comments in a period is significantly higher than in other periods and lasts for a period of time, it is considered a relatively special period. The response of the public shows different characteristics in different periods, and the number of microblog comments, forwarding, and reading can reflect the public's attention and attention [44]. When the number of comments at a certain stage shows the same trend and reaches the peak at a certain point, this point can be used as the dividing line of public opinion stages. This paper divides the development of public concern about food waste into five stages: (1) Incubation period (A: 2020.8.11-8.16): During this period, the number of Weibo comments was relatively small, and most comments expressed opinions about wasteful phenomena, such as king of the eaters and mukbang. (2) Outbreak period (B: 8.17-8.28): During this period, multi-forces of the government, universities, social organizations, catering industry, online media, public figures appealed to all classes of society to save food and adopted some measures to stop food waste. The multi-forces guidance led to a sharp rise in public concern about the topic of food waste. Based on this, the number of comments quickly soared to a peak. (3) Recession period (C: 8.29-9.15): Both the public concern and the number of comments about the topic of food waste gradually decreased. (4) Second outbreak period (D: 9.16-9.21): The Ministry of Education issued an action plan of \"Stop Food Waste and Cultivate Saving Habits\", and then various universities formulated corresponding measures according to actual situations. The impact is that the public concern rebounded, and the number of Weibo comments increased again. (5) Fading period (E: 9.22-10.18): Before and after the double festivals (Mid-Autumn Festival and National Day), the number of comments about food waste decreased greatly. Especially during the National Day holiday, there was even a phenomenon that the number of daily comments was zero. The public concern about food waste gradually faded. The sentiment scores of the public support intention and implementation intention in different periods are calculated using Weibo comments. Furthermore, the change in public attitude after release-type communication to stop food waste is analyzed based on the absolute score and relative score. By analyzing the sentiment scores of the public support intention and implementation intention for release-type communication in five periods (see the bar chart in Figure 2), it was found that the total sentiment score of the public support intention is positive in the incubation period (positive score: 243, negative score: \(-\)195). In the outbreak period, both positive and negative scores of support intention increase and accumulate continuously (positive score: 869, negative score: \(-\)1302), but  
Figure 1: Trends in public concern about food waste. A–E represent five stages. A: incubation period, 2020.8.11–8.16. B: outbreak period, 2020.8.17–8.28.