Object: At present, the major cities that have introduced waste separation policies in China all use "blue" to correspond to recyclable garbage cans instead of "green", which is inconsistent with the traditional concept of "green" environmental protection, "green" recyclable and "green" recycling. This is inconsistent with the traditional concepts of "green" environmental protection, "green" recyclable, and "green" recycling. The purpose of this study is to explore whether green is a more appropriate color for recycling bins or signs than blue, and thus can improve the efficiency of sorting and placing recyclable waste; whether the reason behind this is because of the closer semantic relationship between green and the concept of "recyclable".Method: This thesis consists of two studies. Study 1 examined which color was more appropriate for the recyclable bin and the recyclable bin logo, green or blue, and the differences between genders and ages in the experiment through four simulated waste sorting experiments. Study 2 firstly, used a self-designed questionnaire to measure the external attitudes to examine which color people subjectively felt was more appropriate for the recycling bin, and secondly, used the IAT implicit attitudes test to verify which color, green or blue, was more closely associated with the concept of "recyclable bin".Results: Study 1 found that: (1) When the recyclable bin is green, it is better for the middle-aged and elderly people to perform proper waste separation. (2) For all groups, gray garbage cans with green recyclable signs were faster and better than blue ones. (3) All subjects took significantly less time to put out garbage for the green recyclable bin group than for the blue recyclable bin group, and the correct garbage placement rate for the green recyclable bin group was significantly higher than the correct garbage placement rate for the blue recyclable bin group for the middle-aged and elderly groups. (4) No significant effect of gender on the relationship between color and garbage sorting was found. Study 2 found that: (1) The percentage of people who agreed with green as the color of the recyclable trash can was significantly higher than that of blue. (2) The implicit association test did not find a stronger implicit semantic association between green and the concept of "recyclable" than blue.Conclusion: This thesis demonstrates that green is a more appropriate color for recycling bins or signs than blue among the youth and middle-aged groups in Beijing represented by the sample of this study; this advantage may come mainly from the explicit association between green and the concept of "recyclable". This study has theoretical implications for the effective implementation of waste separation policies in China.
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