The improper disposal of litter by tourists poses a significant threat to tourism destinations worldwide, including in Indonesia. To mitigate marine litter, promoting eco-friendly behavior (EFB) among tourists is essential. This study applies the extended Theory of Planned Behavior (TPB), which posits that an individual’s behavior is driven by their attitudes, subjective norms, and perceived behavioral control, to better understand the factors influencing eco-friendly behavioral intentions. In this research, ecological consciousness and ecological knowledge were added to the traditional TPB framework to gain deeper insights into tourist behavior. Data were collected through a structured questionnaire from 876 visitors to Lake Singkarak, Indonesia. The findings demonstrate that the inclusion of ecological consciousness and ecological knowledge significantly enhances the predictive power of the TPB model in explaining eco-friendly behavioral intentions. Based on these results, raising public awareness, improving government management, and enhancing the quality of lake attractions are recommended to encourage responsible tourism. These measures can reduce litter and conserve lake habitats, ultimately contributing to the sustainability of tourism in the region.

1. Ahmed, M., Shuai, C., Abbas, K., et al. (2022). Investigating health impacts of household air pollution on woman’s pregnancy and sterilization: Empirical evidence from Pakistan, India, and Bangladesh. Energy, 247(2), 123562. https://doi.org/10.1016/j.energy.2022.123562
2. Ajuhari, Z., Isa, S. S., Aziz, A. (2016). Promoting pro-environmental behavior in ecotourism destination. In: Abdullah, M. A., Yahya, W. K., Ramli, N., et al. (editors). Regional Conference on Science, Technology and Social Sciences (RCSTSS 2014). Springer. pp. 1023–1039.
3. Akgün, A. E., Senturk, H. A., Keskin, H., Onal, I. (2020). The relationships among nostalgic emotion, destination images and tourist behaviors: An empirical study of Istanbul. Journal of Destination Marketing & Management, 16(1), 100355. https://doi.org/10.1016/j.jdmm.2019.03.009
4. Arrigo, E., Di Vaio, A., Hassan, R., Palladino, R. (2022). Followership behavior and corporate social responsibility disclosure: Analysis and implications for sustainability research. Journal of cleaner production, 360(1), 132151. https://doi.org/10.1016/j.jclepro.2022.132151
5. Bagozzi, R. P. (1992). The self-regulation of attitudes, intentions, and behavior. Social Psychology Quarterly, 55(2), 178–204. https://doi.org/10.2307/2786945
6. Baloglu, S., McCleary, K. W. (1999). A model of destination image formation. Annals of Tourism Research, 26(4), 868–897. https://doi.org/10.1016/S0160-7383(99)00030-4
7. Bhat, C. R., Guo, J. Y. (2007). A comprehensive analysis of built environment characteristics on household residential choice and auto ownership levels. Transportation Research Part B: Methodological, 41(5), 506–526. https://doi.org/10.1016/j.trb.2005.12.005
8. Cook, K. S., Cheshire, C., Rice, E. R. W., Nakagawa, S. (2013). Social exchange theory. In: DeLamater, J., Ward, A. (editors). Handbook of Social Psychology (Series: HSSR). Springer publishing. pp. 61–88.
9. Correia, A., do Valle, P. O., Moço, C. (2007). Modeling motivations and perceptions of Portuguese tourists. Journal of Business Research, 60(1), 76–80. https://doi.org/10.1016/j.jbusres.2005.10.013
10. Cottrell, S. P., Graefe, A. R. (1997). Testing a conceptual framework of responsible environmental behavior. The Journal of Environmental Education, 29(1), 17–27. https://doi.org/10.1080/00958969709599103
11. Domhoff, G. W. (2017). The invasion of the concept snatchers: The origins, distortions, and future of the continuity hypothesis. Dreaming, 27(1), 14–39. https://doi.org/10.1037/drm0000047
12. Douterelo, I., Perona, E., Mateo, P. (2004). Use of cyanobacteria to assess water quality in running waters. Environmental Pollution, 127(3), 377–384. https://doi.org/10.1016/j.envpol.2003.08.016
13. Gautam, V. (2020). Examining environmental friendly behaviors of tourists towards sustainable development. Journal of Environmental Management, 276(2), 111292. https://doi.org/10.1016/j.jenvman.2020.111292
14. Gohary, A., Shah, A., Hosseini, S. R., et al. (2022). God salience and tourists’ pro-environmental behavior. Annals of Tourism Research, 93(3), 1–4. https://doi.org/10.1016/j.annals.2021.103318
15. Grilli, G., Curtis, J. (2021). Encouraging pro-environmental behaviours: A review of methods and approaches. Renewable and Sustainable Energy Reviews, 135(12), 110039. https://doi.org/10.1016/j.rser.2020.110039
16. Hao, X., Xu, S., Zhang, X. (2019). Barrage participation and feedback in travel reality shows: The effects of media on destination image among Generation Y. Journal of Destination Marketing and Management, 12(4), 27–36. https://doi.org/10.1016/j.jdmm.2019.02.004
17. Hu, H., Zhang, J., Wang, C., et al. (2019). What influences tourists’ intention to participate in the zero-litter initiative in mountainous tourism areas: A case study of Huangshan National Park, China. Science of the Total Environment, 657, 1127–1137. https://doi.org/10.1016/j.scitotenv.2018.12.114
18. Kals, E., Schumacher, D., Montada, L. (1999). Emotional affinity toward nature as a motivational basis to protect nature. Environment and Behavior, 31(2), 178–202. https://doi.org/10.1177/00139169921972056
19. Kang, S. K., Lee, J. (2018). Support of marijuana tourism in Colorado: A residents’ perspective using social exchange theory. Journal of Destination Marketing and Management, 9(3), 310–319. https://doi.org/10.1016/j.jdmm.2018.03.003
20. Kim, S. H., Seock, Y.-K. (2019). The roles of values and social norm on personal norms and pro-environmentally friendly apparel product purchasing behavior: The mediating role of personal norms. Journal of Retailing and Consumer Services, 51(6), 83–90. https://doi.org/10.1016/j.jretconser.2019.05.023
21. Kripa, V., Kaladharan, P., Prema, D., et al. (2016). National marine debris management strategy to conserve marine ecosystems. In: Marine Fisheries Information Service, Technical and Extension Series (MFIS). CMFRI. pp. 3–10.
22. Li, N., Mohd Ariffin, S. Z., Gao, H. (2024). Optimizing Ecotourism in North Taihu Lake, Wuxi City, China: Integrating Back Propagation Neural Networks and Ant-Colony Algorithm for Sustainable Route Planning. International Journal of Management Thinking, 2(1), 1–15. https://doi.org/10.56868/ijmt.v2i1.53
23. Liu, H., Zhu, Q., Khoso, W. M., Khoso, A. K. (2023). Spatial pattern and the development of green finance trends in China. Renewable Energy, 211(C), 370–378. https://doi.org/10.1016/j.renene.2023.05.014
24. Liu, J., An, K., Jang, S. S. (2020). A model of tourists’ civilized behaviors: Toward sustainable coastal tourism in China. Journal of Destination Marketing and Management, 16(2), 100437. https://doi.org/10.1016/j.jdmm.2020.100437
25. Liu, J., Li, J., Jang, S. S., Zhao, Y. (2022). Understanding tourists’ environmentally responsible behavior at coastal tourism destinations. Marine Policy, 143(12), 105178. https://doi.org/10.1016/j.marpol.2022.105178
26. Luo, W., Tang, P., Jiang, L., Su, M. M. (2020). Influencing mechanism of tourist social responsibility awareness on environmentally responsible behavior. Journal of Cleaner Production, 271(2), 122565. https://doi.org/10.1016/j.jclepro.2020.122565
27. Makhdoom, Z. H., Gao, Y., Song, X., et al. (2023). Linking environmental corporate social responsibility to firm performance: The role of partnership restructure. Environmental Science and Pollution Research, 30(16), 48323–48338. https://doi.org/10.1007/s11356-023-25776-1
28. Merino, F., Prats, M. A. (2020). Sustainable beach management and promotion of the local tourist industry: Can blue flags be a good driver of this balance? Ocean & Coastal Management, 198(2), 105359. https://doi.org/https://doi.org/10.1016/j.ocecoaman.2020.105359
29. Neto, J. G. B., Rodrigues, F. L., Ortega, I., et al. (2020). Ingestion of plastic debris by commercially important marine fish in southeast-south Brazil. Environmental Pollution, 267, 115508. https://doi.org/10.1016/j.envpol.2020.115508
30. Nicoletta, R., Servidio, R. (2012). Tourists’ opinions and their selection of tourism destination images: An affective and motivational evaluation. Tourism Management Perspectives, 4, 19–27. https://doi.org/10.1016/j.tmp.2012.04.004
31. Northey, G., Chan, E. Y. (2020). Political conservatism and preference for (a) symmetric brand logos. Journal of Business Research, 115(1), 149–159. https://doi.org/10.1016/j.jbusres.2020.04.049
32. Panwanitdumrong, K., Chen, C.-L. (2021). Investigating factors influencing tourists’ environmentally responsible behavior with extended theory of planned behavior for coastal tourism in Thailand. Marine Pollution Bulletin, 169, 112507. https://doi.org/10.1016/j.marpolbul.2021.112507
33. Portman, M. E., Brennan, R. E. (2017). Marine litter from beach-based sources: Case study of an Eastern Mediterranean coastal town. Waste Management, 69, 535–544. https://doi.org/10.1016/j.wasman.2017.07.040
34. Russell, D. W., Russell, C. A. (2010). Experiential reciprocity: The role of direct experience in value perceptions. Journal of Travel and Tourism Marketing, 27(6), 624–634. https://doi.org/10.1080/10548408.2010.507157
35. Russell, J. A., Pratt, G. (1980). A description of the affective quality attributed to environments. Journal of Personality and Social Psychology, 38(2), 311–322. https://doi.org/10.1037//0022-3514.38.2.311
36. Severo, E. A., De Guimarães, J. C. F., Dellarmelin, M. L. (2021). Impact of the COVID-19 pandemic on environmental awareness, sustainable consumption and social responsibility: Evidence from generations in Brazil and Portugal. Journal of Cleaner Production, 286, 124947. https://doi.org/10.1016/j.jclepro.2020.124947
37. Soorani, F., Ahmadvand, M. (2019). Determinants of consumers’ food management behavior: Applying and extending the theory of planned behavior. Waste Management, 98, 151–159. https://doi.org/10.1016/j.wasman.2019.08.025
38. Su, L., Swanson, S. R. (2017). The effect of destination social responsibility on tourist environmentally responsible behavior: Compared analysis of first-time and repeat tourists. Tourism Management, 60(C), 308–321. https://doi.org/10.1016/j.tourman.2016.12.011
39. Thurnell-Read, T. P. (2009). Engaging Auschwitz: An analysis of young travellers’ experiences of Holocaust tourism. Journal of Tourism Consumption and Practice, 1(1), 26–52.
40. Um, S., Crompton, J. L. (1990). Attitude determinants in tourism destination choice. Annals of Tourism Research, 17(3), 432–448. https://doi.org/10.1016/0160-7383(90)90008-F
41. Valente, T., Scacco, U., Matiddi, M. (2020). Macro-litter ingestion in deep-water habitats: Is an underestimation occurring? Environmental Research, 186, 109556. https://doi.org/10.1016/j.envres.2020.109556
42. Vickers, N. J. (2017). Animal communication: When I’m calling you, will you answer too? Current Biology, 27(14), R713–R715. https://doi.org/10.1016/j.cub.2017.05.064
43. Walker, G. J., Chapman, R. (2003). Thinking like a park: The effects of sense of place, perspective-taking, and empathy on pro-environmental intentions. Journal of Park and Recreation Administration: Special Issue–Sustainable Places, 21(4), 71–86.
44. Wang, C., Zhang, J., Cao, J., et al. (2019a). The influence of environmental background on tourists’ environmentally responsible behaviour. Journal of Environmental Management, 231, 804–810. https://doi.org/10.1016/j.jenvman.2018.10.089
45. Wang, J., Yang, J., Zheng, C., Wang, C. (2019b). Effect of tourist motivation on destination image with a dark tourism site: Case study of the Beichuan Earthquake Memorial Site, China. Tourism Tribune, 34(9), 114–126.
46. Woo, E., Kim, Y. G. (2019). Consumer attitudes and buying behavior for green food products: From the aspect of green perceived value (GPV). British Food Journal, 121(2), 320–332. https://doi.org/10.1108/bfj-01-2018-0027
47. Xu, H., Lv, X. (2019). Sonic branding: The effect of destination songs on tourists’ perceived image (Chinese). Tourism Science, 33(06), 1–16.
48. Xu, X., Wang, S., Yu, Y. (2020). Consumer’s intention to purchase green furniture: Do health consciousness and environmental awareness matter? Science of the Total Environment, 704, 135275. https://doi.org/10.1016/j.scitotenv.2019.135275
49. Yu, X., Wu, X., Zhang, Y., Wang, Y. (2015). Factors driving environmentally responsible behaviors by tourists: A case study of Taiwan, China (Chinese). Tourism Tribune, 30(7), 49–59.