Currently approximately 9 million tons of plastic enter the world's oceans annually. This is a major transboundary problem on a global scale that threatens marine wildlife, coastal ecologies, human health and livelihoods. Our concern in this paper is with the environmental governance of marine plastic pollution that emanates from Thailand, the sixth biggest contributor globally. By zooming in on land‐based polluters in Thailand, we highlight both the systemic nature of the marine plastic problem and the relative impunity with which drivers of transboundary environmental harm function at all levels of governance. Drawing from 19 interviews conducted with actors from the public, private and non‐profit sectors, we examine three stages of the problem: production, consumption and waste management. We found that three major barriers prevent Thailand's government, private sector and citizens from engaging in the sort collective action needed to reduce marine plastic pollution. They are: (i) insufficient incentives to enact political change; (ii) scalar disconnects in waste management; and (iii) inadequate public and private sector ownership over plastic waste reduction. As the state alone cannot change corporate and consumer behaviour, we argue that multi‐stakeholder efforts across organisational scales of governance and administrative boundaries are needed to address the barriers.

The continued usage of inefficient lighting products in residential sectors is one of the major causes of the rapid growth in global energy consumption. Their replacement with highly efficient lighting appliances could avoid large amounts of electricity consumption and reduce CO₂ emissions worldwide. In this regard, the collective contribution by the residential sector is extremely important and the increase in demand for energy-efficient lighting products can help achieve sustainability goals. This study aims to examine the determinants of household consumers’ behaviors in purchasing energy-saving lighting products by applying the Theory of Planned Behavior (TPB) as the main theoretical framework. Data (n = 288) from a survey in Thailand were analyzed using causal Structural Equation Modeling (SEM). The results suggested that attitude has the largest direct effect, while subjective norm was the weakest predictor of purchase intention towards light-emitting diode (LED) products. In addition, this study expands the TPB by including an investigation of a direct effect of attitude on purchase behavior. The results suggest that attitudes have a strong direct influence on the purchasing behavior for LED products. Additionally, only some socio-demographic variables have significant effects on purchase behavior. The study’s findings highlight several implications for policymakers, the private sector, and green marketers in developing practical strategies. Furthermore, suggestions and future research directions are discussed.

Thailand has one of the highest usage of plastic bags globally, with over 45,000 million plastic carrier bags used annually. Because of its high plastic consumption and mismanagement of plastic waste, Thailand was ranked sixth globally in terms of its contribution to marine plastic pollution in 2015. While many countries have introduced plastic bag charges or taxes to reduce consumption, the Thai government is reluctant to do likewise due to political concerns about whether the public will accept this. This study presents findings on perception and acceptance level of university students towards plastic bag charging program in their campuses. We investigated the factors influencing intention and behavior and changes in students’ attitude from 2017–2019. Results show that students’ reusable/cloth bags use behavior and charge acceptance have increased over time. Testing is based on the Theory of Planned Behavior. We find that the factor which most influences consumers’ intention is perceived behavior control, which itself is determined by waste impact knowledge level and the perceived convenience of carrying reusable bag. In addition, the finding show that charging schemes are effective in breaking the habit of using plastic which will lead to a sustained change in behavior. Hence, policymakers should move implement plastic bag charging regulations in Thailand.

Sustainable consumption and production (SCP) is largely influenced by dynamics in the market system. Hence, this study adopts the systems thinking approach as a tool to understand the non-linearity and complexity of sustainable practices. The food delivery business has accelerated the plastic waste problem, especially during COVID-19 where restaurant dine-in was limited. This study aims to identify high leverage points, which contribute to system intervention strategies to improve Thailand’s single-use plastics (SUP) waste situation caused by the food delivery sector. Semi-structured interviews were conducted with relevant stakeholders (n = 14). A qualitative system dynamics model analysis and thematic analysis suggest that the key leverage points include (1) benefit alignment among all stakeholders, (2) cost minimization and profit maximization, (3) laws and regulations, (4) postconsumption waste management systems, and (5) research and development. In addition, to stimulate policy initiatives, this study suggests that system intervention strategies should include behavioral instruments (setting default and eco-labelling), market-based instruments (green-packaging procurement and subsidies), and system and infrastructure provision (waste management systems and deposit return models). Partnerships, research and development, and laws and regulations are proposed as supporting measures.