The Theory of Planned Behavior has long served as a stalwart model within social psychology to elucidate the connections between individual attitudes, perceived control, social norms, and behavior. This framework posits that intention—a deliberate plan to act—is the immediate antecedent of behavior, itself influenced by attitudes toward the behavior, subjective norms, and perceived behavioral control (PBC). Canova et al. extend this conceptual model to examine the specific context of refillable bottle usage, aligning behavioral science with environmental objectives, particularly the Sustainable Development Goals aimed at curtailing plastic waste.

Delving into their methodology, the researchers conducted comparative surveys among Italian university students and a broader cohort of non-student adults, meticulously measuring core TPB components alongside additional psychological constructs such as self-identity. The inclusion of self-identity, a relatively novel extension, acknowledges that personal identification with behaviors can profoundly motivate consistent action, especially when tied to self-presentation and social signaling.

Their findings strikingly underscore that both attitudes and perceived behavioral control emerge as pivotal predictors of the intention to use refillable bottles. This suggests that individuals who not only positively evaluate refillable bottle use but also feel confident in their ability to perform the behavior are more likely to intend to adopt it. This dual influence reveals a nuanced interplay where cognitive evaluation and perceived facilitation jointly inform behavioral plans.

Moreover, intention, corroborated by past behavior, robustly predicts future usage of refillable bottles. The incorporation of past behavior into the model enriches predictive accuracy by recognizing habitual tendencies that can either reinforce or hinder new intentions. These results elegantly illustrate that behavior is not merely a function of attitudes and control perceptions but also deeply entrenched in history and experience.

An intriguing dimension is the differential relevance of self-identity across the studied groups. For non-student adults, self-identity exerts a more pronounced effect on intentions, suggesting that social and psychological dimensions linked to one’s identity and self-presentation strategies significantly motivate environmentally responsible behavior outside the university milieu. This insight posits that non-student adults may view refillable bottle use less as an abstract sustainability tactic, and more as an expression of personal values and social belonging.

The study also accentuates the broader implications of daily behaviors like refillable bottle usage within the context of global environmental sustainability. Given the staggering volumes of plastic production and its attendant pollution challenges, promoting such habitual actions offers a scalable and practical pathway toward mitigating environmental degradation. Yet, the authors lament the relative paucity of socio-psychological research in this domain, emphasizing a critical gap in understanding the precise motivators and barriers to plastic-reducing behaviors.

Furthermore, the research meticulously charts the conceptual pathways within the extended TPB model, illustrating how various psychological factors cascade to influence intentions and, subsequently, behavior. This refined perception equips policymakers and public health advocates with actionable knowledge to design interventions that resonate with individuals’ attitudes and empower their control perceptions.

For instance, educational campaigns could be tailored to improve positive attitudes toward refillable bottle use by highlighting environmental benefits and personal health advantages, while simultaneously removing logistical barriers that impede access or convenience—thereby enhancing perceived behavioral control. Leveraging social identity cues, especially among adults, might further amplify adoption by linking the behavior to desirable social groups or values.

In the context of university students, the comparatively lower significance of self-identity raises important questions about the relative weight of social norms and environmental awareness in shaping sustainable habits. Universities, as pivotal sites for socialization, may provide fertile ground for interventions that cultivate collective norms favoring environmental stewardship, thereby indirectly influencing intention and behavior.

Moreover, this research invites an interdisciplinary dialogue connecting social psychology, environmental science, and behavioral economics. Addressing plastic pollution necessitates an integrative approach whereby behavioral intentions are not only understood but actively harnessed to yield concrete changes in consumption patterns. The present study contributes a crucial psychological dimension to this multifaceted challenge.

Notably, the emphasis on refillable bottle use as a target behavior serves as a microcosm for broader sustainability initiatives. Plastic bottle consumption is emblematic of single-use culture, and understanding the psychological levers for switching to refillable options could inform efforts aimed at other single-use items, ranging from shopping bags to food packaging.

Beyond its empirical contributions, the study’s theoretical advances demonstrate the utility of expanding classic models like TPB with additional constructs such as self-identity and past behavior. This enhances the explanatory power of the framework and encourages researchers to adopt more holistic perspectives when investigating environmentally related behaviors.

Taken together, Canova and colleagues’ research embodies a vital step forward in unveiling the cognitive, social, and identity-based processes that sustain ecological habits. Their findings lay the groundwork for more tailored, psychologically grounded interventions that can be deployed across diverse population segments to foster a cultural shift toward sustainability.

As plastic pollution continues to choke ecosystems and imperil human health globally, insights gleaned from this study emphasize the power of everyday actions, such as opting for refillable bottles, to accumulate meaningful environmental benefits. It is a reminder that fine-grained understanding of behavior can fuel large-scale change principles essential for achieving the Sustainable Development Goals.

Future inquiries might delve deeper into the social normative influences that shape the behavior of university students and the contextual factors that impact perceived control across age groups. Additionally, longitudinal research could substantiate the causal links and temporal stability of intentions and behaviors, furnishing richer data on habit formation and maintenance.

In a world grappling with environmental urgency, bridging gaps between psychological theory and practical sustainability solutions is imperative. The extended TPB model applied by Canova et al. opens promising avenues for transforming individual intentions into collective environmental action, highlighting the profound potential embedded in ordinary daily choices.

Their research not only enriches academic discourse but also sends a clarion call to policymakers, educators, and consumers alike: by understanding and influencing the psychology of refillable bottle use, society can take a decisive step toward reducing plastic waste and protecting the planet for generations to come.

Subject of Research: The psychological determinants and predictive mechanisms underlying refillable bottle use among Italian university students and non-student adults, examined through an extended Theory of Planned Behavior framework.

Article Title: Use of refillable bottles by Italian students and non-student adults: testing an extended model of the theory of planned behavior.

Article References:
Canova, L., Bobbio, A., Benincà, A. et al. Use of refillable bottles by Italian students and non-student adults: testing an extended model of the theory of planned behavior. Humanit Soc Sci Commun 12, 1648 (2025). https://doi.org/10.1057/s41599-025-05962-x

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This research stands out by utilizing an extended version of the Norm Activation Model (NAM)—a framework traditionally focused on moral psychology—to explore the depth of personal and social motivations behind recycling intentions. The NAM framework hinges on the idea that individuals’ pro-environmental behaviors are often driven by an activated sense of moral obligation, a construct known as personal norm (PN). Alongside this, the model incorporates social norm (SN) influences, which capture the social pressures and expectations exerted by peers, family, and broader society.

At the core of the study’s findings is the confirmation that both personal norms and social norms significantly shape the consumers’ intention to recycle retired EV batteries. This echoes the results of earlier investigations (Wu et al., 2022; Yuda Bakti et al., 2020) that emphasize the importance of moral convictions in motivating behaviors that benefit the environment. Notably, the role of social norms illuminates how behaviors are not merely individual choices but are heavily intertwined with prevailing societal expectations and communal influences.

Crucially, the research underscores the role of “awareness of consequences” (AC)—a psychological recognition of the environmental impact that one’s actions can have. This variable was found to exert a significant influence on personal norms, implying that individuals are more likely to feel a moral obligation to recycle when they are acutely aware of the damage that retired batteries could inflict on the environment if mishandled. The importance of environmental consciousness as a precursor to moral commitment aligns with previous empirical evidence and theoretical understandings (Wu et al., 2022).

Equally intriguing is the study’s finding regarding after-sales service quality, a variable that has traditionally been considered in consumer recycling and product lifecycle studies. Contrary to earlier research such as that by Kong et al. (2017), this investigation reveals that the quality of after-sales services does not significantly influence recycling behavior for EV batteries. This divergence could reflect a shift in consumer behavior, where high costs of repair and the rapid technological evolution in EV markets are encouraging users to upgrade rather than repair or recycle, pointing to systemic economic barriers beyond mere service support.

Another fascinating insight emerged unexpectedly: high-income and well-educated consumers are not markedly more engaged in recycling their EV batteries compared to other demographic groups. This suggests that economic resources and educational background alone do not bridge the gap in recycling behavior, signaling potential deficiencies in communication strategies or motivational frameworks that fail to resonate with these segments. The authors suggest future qualitative research to unpack these subtleties and explore the psychological or contextual factors at play.

Methodologically speaking, the extended NAM model employed in this research passed rigorous reliability and validity tests, affirming its robustness in capturing the complexity of behavioral intentions. Unlike the more commonly used Theory of Planned Behavior (TPB), which has traditionally dominated environmental behavior research, the NAM offers a moral dimension that better explains pro-environmental intentions such as recycling, highlighting the model’s growing relevance in this field.

The fitted model’s parameters met all acceptable thresholds, signaling a good fit that strengthens the confidence in these findings. This methodological rigor not only advances theoretical contributions but also provides policymakers and practitioners with a validated tool to better understand and influence recycling behaviors in the context of EV batteries.

Beyond the psychological constructs, the study importantly sheds light on systemic barriers that limit recycling participation, emphasizing that promoting moral and social norms alone will not suffice. Structural challenges such as accessibility of recycling services and the availability of clear and reliable information remain significant hurdles to scaling recycling efforts. The interplay of individual intentions and systemic infrastructure calls for a holistic approach to policy design.

From a policy perspective, the findings suggest multiple actionable pathways to stimulate EV battery recycling. Strengthening both personal and social norms through education and public engagement emerges as a critical lever. Integrating moral education into school curricula can nurture environmental responsibility from an early age, creating long-term cultural shifts toward sustainability.

Financial incentives represent another powerful avenue. Subsidies, rebates, or discounts for those who participate in battery recycling programs can offset the perceived costs and inconvenience associated with proper disposal, effectively nudging behavior. Designing these incentives to be straightforward and widely accessible will be key to maximizing uptake.

The study also advocates for the establishment of convenient, visible recycling channels to reduce friction for participants. The easier and more intuitive the recycling process is made, the more likely consumers are to engage. This infrastructural approach complements psychological motivators and ensures no logistical barriers deter potential recyclers.

Public campaigns and community engagement initiatives hold promise in amplifying social norms that encourage recycling. By leveraging trusted voices—community leaders, social media influencers, and peer networks—these campaigns can shift perceptions and behaviors at a grassroots level. The power of social proof and contagious positive attitudes should not be underestimated.

Collaboration between government bodies and private enterprises is highlighted as critical to creating a shared, trustworthy network for EV battery recycling. Establishing joint platforms can enhance system efficiency, transparency, and consumer confidence. This cooperative governance model points to an integrated solution that combines regulatory support with market mechanisms.

Ultimately, this study reveals that fostering a sustainable circular economy for EV batteries requires a nuanced understanding of human psychology, social dynamics, and systemic infrastructure. The extended NAM model serves as a vital instrument in dissecting these complexities and guiding intervention strategies.

As the world accelerates toward electrified mobility, responsible end-of-life management for EV batteries will be pivotal in mitigating environmental risks associated with toxic materials and resource depletion. Harnessing social and moral dimensions, while simultaneously addressing structural limitations, offers a multifaceted approach to bolster recycling behaviors at scale.

In light of these findings, the pathway to achieving meaningful environmental outcomes in EV battery management resides not only in technological innovation but also, importantly, in the design of psychologically informed policies and seamless service ecosystems. This integrative strategy promises to accelerate the transition toward sustainable consumption patterns indispensable for a greener future.

With regulatory frameworks and market actors increasingly attuned to these behavioral insights, future research could expand on these findings by incorporating cross-cultural comparisons, longitudinal designs, and experimental interventions. Such efforts will deepen our understanding of how to cultivate enduring recycling habits amidst evolving economic and technological contexts.

This study marks a significant advancement by linking moral psychology and social influence theories to an emergent environmental challenge. It invites environmental scientists, behavioral economists, policymakers, and industry stakeholders to collaborate toward solutions that align individual motivations with collective sustainability imperatives.

Subject of Research: Factors influencing consumer intention to recycle retired electric vehicle batteries, examined through an extended Norm Activation Model framework.

Article Title: Factors influencing residents’ inclination towards engaging in the recycling of electric vehicle batteries.

Article References:
Zuo, C., Yan, X., Chen, Z. et al. Factors influencing residents’ inclination towards engaging in the recycling of electric vehicle batteries. Humanit Soc Sci Commun 12, 1380 (2025). https://doi.org/10.1057/s41599-025-05704-z

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