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12 Barriers to Implementation Table 5 Proportion of respondents from U.S. and The survey also sought to identify the reasons behind failed Non-U.S. airports identifying key barriers to or slow implementation of sustainability practices at U.S. implementation of sustainability practices and non-U.S. airports. Respondents were asked to list three Barrier To Sustainability Practices barriers to implementation of sustainability practices at their Understanding/ airports. Management Knowledge Training/ Behavior Funding Culture/ Staffing Table 5 shows the five key barriers identified by respon- dents and gives the proportion of U.S. and non-U.S. airport Airport Size respondents who identified these topics as impediments to U.S. Airports sustainability practices at their airports. Non- 100% 0% 0% 0% 0% Hub (1) U.S. Airports Small 50% 0% 50% 0% 0% Hub (2) A lack of funding was identified as the key barrier to imple- Medium mentation of sustainability by 10 of the 16 U.S. respondents. 75% 0% 0% 25% 0% % Respondents Hub (4) A variety of other impediments received roughly equal men- Large tion: lack of staffing, lack of management support, lack of Hub (9) 56% 33% 11% 22% 33% an environmental culture, and limited staff understanding Non-U.S. Airports of sustainability. Continental 60% 0% 20% 20% 0% Europe (5) Respondents from small and medium U.S. airports espe- cially cited lack of management support or an environmen- Asia (1) 100% 0% 0% 0% 0% tal culture in their organization, whereas respondents from United 100% 0% 0% 0% 0% large airports were more likely to mention lack of funding, Kingdom (1) lack of staffing, and lack of understanding/knowledge as Canada (2) 50% 50% 50% 0% 50% barriers. the success of implementation difficult. Less common Non-U.S. Airports responses included: As with their U.S. peers, respondents from non-U.S. air- Strong political variability (continental Europe). ports--especially those in Asia and the UK--identified Limited time to devote or dedicate to sustainability lack of funding as the most common barrier. Unlike any (Asia). other non-U.S. respondents, one of the continental Europe Lack of experienced professionals (Canada). respondents identified that the absence of a culture and Lack of understanding of social sustainability behavior that supports sustainability practices makes (Canada).