It is required to gain broad social approval for the transition toward a sustainable society. Using online survey data of 3,000 samples, we analyzed the relationship between the citizens’ approval or not of pro-motion policies for sustainable transportation, the reason for policy choice, the way of decision on policy choices, and citizens’ morality on daily choices. As a result, the situation and the feature of the approval or not are revealed. It is effective to give proper information according to their various morality to in-crease approval for the sustainable policies. For example, it is important to communicate the relations between the policies and their daily life to those who take care of utility, and to communicate the details of the policies to those who take care of compliance awareness. It is also important to raise the sense that the future vision of city is decided by the citizens through accumulating opportunities of public participation.

This study examines the perceptions of “green curtains” in a city and their influence on the promotion of power saving behavior of residents at home and their trust in local government implementing global warming prevention policy. “Green curtains,” that can be made with covering vine such as bitter gourd with nets stretched out of windows or on walls, are expected to contribute to improving indoor temperatures. The analysis was performed using structural equation modeling with questionnaire data from residents of two cities. The proposed model reveals that residents’ perception of green curtains in the city influences the evaluation of green curtain spreading measures and of global warming prevention policies in both cities, and also influences the promotion of power saving behavior (air conditioning) in Z city. Furthermore, the evaluation of green curtain spreading measures was found to influence the evaluation of the local government’s ability and value similarity regarding global warming prevention policy in Fukuchiyama. In addition, by conducting a comparative analysis of residents’ awareness of green curtain spreading measures, the perception of green curtains in the city affects the promotion of power saving behavior (others) only in high awareness groups in both cities, and also affects the promotion of power saving behavior (air conditioning) in high awareness groups only in Z city.