As a significant global issue, food waste has garnered considerable public attention because of food security and environmental sustainability. However, the current study overlooks the food waste behavior of university students in university canteens. This study, which is based on a systematic questionnaire survey of 1229 university students in Macao and Zhuhai, adopts the extended theory of planned behavior (E-TPB) to investigate the key factors influencing university students' food waste behaviors in school canteens by incorporating four additional variables. The results demonstrate that subjective norm emerged as the strongest predictor of university students' intentions, whereas intentions remained the strongest predictor of university students' food waste behavior (R² = 0.641). Among the four extended hypotheses, the economic impact and cognition of food waste have a significant effect on university students’ food waste behavior. This study revealed that increasing the level of awareness and positive attitudes toward food waste can help reduce food waste. Compared with those in Macao, the food waste behavior of respondents in Zhuhai was more influenced by the level of the economy. These research outcomes provide effective strategies for minimizing food waste within university canteens.

The construction industry is often seen as one of the most dynamic sectors, referring to large resource consumption and waste generation, and has grown rapidly in the last few decades. Under the background of "Zero Waste City, " it will be essential to understand the metabolic stock-flow process and the driving forces of urban building resources. By combining the top-down and bottom-up methods, this study establishes a dynamic material flow analysis (MFA) model to clarify the stock and flow characteristics, driving forces, and future trends of urban building resources in Macao China. The result shows that the total material stock increased from 14.13 million metric tons (Mt) in 1999 to 32.75 Mt in 2018, with an average annual growth rate of 4.29%. In 2018, metal resources accounted for 10.73% of the total building stock (steel and aluminum resources accounted for 10.30% and 0.43%, respectively), and non-metal resources accounted for 89.27%. The construction demolition waste (CD&W) increased from 0.02 Mt in 1999 to 0.69 Mt in 2018. Among metal materials, steel and aluminum accounted for 7.11% and 0.4%, respectively. The demolition quantity of metal resources increased from 1.6 kilotons (kt) in 1999 to 51.8 kt in 2018 (an average annual increase of 1.59%) and peaked at 95.2 kt in 2007. The IPAT (I-environment impact; P-population factor; A-social affluence factor; T-technology factor) method results show that the economy and population are always the driving force for urban building resources stock in Macao China. The scenario analysis shows that, by 2035, the maximum stock of urban building materials in Macao will reach 65.19 Mt, about twice in 2018. The results are expected to provide a theoretical basis for establishing scientific resource management and recycling systems for urban buildings.