Sustainable Consumption and the Role of Digital Marketing in Shaping Consumer Behaviour: A Study of Consumers in Enugu Metropolis

1.1 Background of the Study

Consumption patterns across the world are undergoing a fundamental shift as environmental degradation, climate change and resource depletion push sustainability from the margins of public discourse into the centre of consumer decision-making. Sustainable consumption, broadly understood as the use of goods and services in ways that minimise environmental harm while meeting present needs without compromising the ability of future generations to meet theirs, has become both a policy priority and a marketing imperative, as outlined in UNEP's sustainable consumption and production handbook (United Nations Environment Programme, 2022). Governments, multilateral bodies and corporations alike now frame sustainability as central to the achievement of the Sustainable Development Goals, particularly Goal 12 on responsible consumption and production.

Parallel to this shift is the rapid expansion of digital marketing as the dominant channel through which brands communicate with consumers. Social media platforms, influencer partnerships, content marketing, search engine marketing and e-commerce ecosystems have transformed how information about products, including their environmental credentials, reaches the buying public. Digital marketing offers brands unprecedented capacity to educate, persuade and mobilise consumers around sustainability claims at a scale and speed that traditional media could never achieve (Kotler, Kartajaya & Setiawan, 2021). Through targeted content, storytelling and interactive engagement, digital marketing has become a primary vehicle through which sustainability narratives are constructed and consumed.

In Nigeria, and specifically within urban centres such as Enugu metropolis, internet penetration and social media adoption have grown considerably, with millions of Nigerians now engaging daily with platforms such as Instagram, Facebook, TikTok and X (formerly Twitter), a trend reflected in Statista's social media usage statistics for Nigeria. This growing digital footprint has attracted brands seeking to position themselves as environmentally responsible, whether through eco-labelling campaigns, green product launches or partnerships with sustainability-focused influencers. However, the extent to which such digital marketing efforts genuinely translate exposure and awareness into actual sustainable purchasing behaviour among Nigerian consumers remains an open empirical question, particularly given documented gaps between environmental attitudes and actual purchase behaviour — a phenomenon widely referred to in marketing literature as the attitude-behaviour gap (Park & Lin, 2020).

This study therefore investigates sustainable consumption and the role of digital marketing in shaping consumer behaviour, using consumers in Enugu metropolis as a focal point, with a view to understanding how digital marketing exposure, influencer engagement and awareness-creation efforts interact to influence sustainable purchase decisions in an emerging urban market.

1.2 Statement of the Problem

Despite the proliferation of digital marketing campaigns promoting eco-friendly products, recycling, ethical sourcing and green lifestyles, sustainable products in many Nigerian markets continue to record comparatively low patronage relative to conventional alternatives. Brands invest substantially in social media advertising, influencer endorsements and content marketing built around sustainability themes, yet anecdotal and industry evidence suggests that consumer purchase behaviour does not always mirror the awareness and positive attitudes these campaigns appear to generate.

This disconnect raises several concerns. First, it is unclear whether digital marketing content about sustainability is actually reaching and resonating with Nigerian urban consumers in ways that shift purchase intentions, or whether such content is perceived as promotional rhetoric with limited credibility — a concern often labelled 'greenwashing' in the marketing literature (Delmas & Burbano, 2011). Second, the specific contribution of social media influencer marketing to sustainable purchase intention within the Nigerian context has received limited empirical attention, despite influencer marketing's growing budget share among Nigerian brands. Third, existing studies on sustainable consumption in Nigeria have tended to focus on general environmental attitudes or willingness-to-pay constructs, with comparatively few studies examining the specific mechanisms — awareness creation, influencer credibility, content engagement — through which digital marketing shapes actual consumption behaviour in a defined urban market such as Enugu.

It is against this background that this study sets out to examine sustainable consumption and the role of digital marketing in shaping consumer behaviour among consumers in Enugu metropolis, in order to generate empirically grounded insight into how digital marketing strategies can be more effectively deployed to convert environmental awareness into sustained purchasing action.

1.3 Aim and Objectives of the Study

The aim of this study is to examine sustainable consumption and the role of digital marketing in shaping consumer behaviour among consumers in Enugu metropolis. The specific objectives are to:

1. Examine the relationship between consumers' exposure to digital marketing content and their sustainable consumption behaviour in Enugu metropolis.

2. Assess the influence of social media influencer marketing on consumers' intention to purchase eco-friendly and sustainable products.

3. Evaluate the role of digital marketing platforms in creating awareness of sustainable consumption practices among consumers in Enugu metropolis.

4. Identify the challenges confronting digital marketing campaigns designed to promote sustainable consumption in the Nigerian market.

1.4 Research Questions

This study seeks to answer the following research questions:

1. What is the relationship between consumers' exposure to digital marketing content and their sustainable consumption behaviour in Enugu metropolis?

2. To what extent does social media influencer marketing influence consumers' intention to purchase eco-friendly and sustainable products?

3. What role does digital marketing play in creating awareness of sustainable consumption practices among consumers in Enugu metropolis?

4. What challenges confront digital marketing campaigns designed to promote sustainable consumption in the Nigerian market?

1.5 Research Hypotheses

The following hypotheses, stated in the null form, were formulated to guide the study:

1. H01: There is no significant relationship between consumers' exposure to digital marketing content and their sustainable consumption behaviour in Enugu metropolis.

2. H02: Social media influencer marketing does not significantly influence consumers' intention to purchase eco-friendly and sustainable products.

3. H03: Digital marketing platforms do not significantly influence consumers' awareness of sustainable consumption practices in Enugu metropolis.

1.6 Significance of the Study

This study holds relevance for several categories of stakeholders. To marketing practitioners and brand managers, the findings offer evidence-based insight into which dimensions of digital marketing — content exposure, influencer credibility, or awareness campaigns — most effectively drive sustainable consumption, enabling more efficient allocation of marketing budgets toward genuinely persuasive strategies rather than symbolic sustainability messaging.

To policymakers and regulatory bodies, particularly agencies concerned with consumer protection and environmental standards, the study provides context-specific evidence on how digital communication shapes consumption patterns, which can inform guidelines around truth-in-advertising and green marketing claims. To the academic community, the study contributes to the relatively limited body of Nigerian-context empirical literature linking digital marketing constructs directly to sustainable consumption outcomes, extending existing theoretical models such as the Theory of Planned Behaviour and the AIDA model into a digital-sustainability context. Finally, the study benefits students and future researchers by providing a methodological and empirical reference point for further studies on green marketing, digital consumer behaviour and sustainability communication within emerging markets.

1.7 Scope of the Study

This study is delimited to an examination of sustainable consumption and the role of digital marketing in shaping consumer behaviour among consumers resident in Enugu metropolis, comprising Enugu East, Enugu North and Enugu South Local Government Areas. The study focuses specifically on digital marketing dimensions relevant to sustainability communication — content exposure, social media influencer marketing and awareness-creation — and their relationship with self-reported sustainable consumption behaviour and purchase intention. The study is cross-sectional, with data collected within a defined period, and does not track behaviour change over time.

1.8 Limitations of the Study

As with most survey-based consumer research, this study is subject to certain limitations. First, the reliance on self-reported data introduces the possibility of social desirability bias, as respondents may overstate their sustainable consumption behaviour to appear environmentally conscious. Second, the study's geographical focus on Enugu metropolis limits the generalisability of findings to other Nigerian cities with different socioeconomic and digital-access profiles. Third, time and resource constraints limited the sample to consumers who are active internet and social media users, which may exclude perspectives from less digitally engaged segments of the population. These limitations were mitigated, where possible, through anonymised data collection and a sufficiently large sample size to support statistical reliability.

1.9 Operational Definition of Terms

• Sustainable Consumption: The use of products and services in a manner that minimises negative environmental impact, conserves resources and considers the welfare of future generations, as measured in this study by respondents' self-reported eco-friendly purchasing and usage habits.

• Digital Marketing: The use of internet-based channels — including social media, websites, email and mobile applications — to promote products, services or brand values to consumers, operationalised in this study through respondents' exposure to sustainability-related digital content.

• Consumer Behaviour: The decision-making processes and actions of individuals in searching for, evaluating, purchasing and using products and services, measured here through purchase intention and reported buying patterns.

• Influencer Marketing: A form of social-media-based marketing involving endorsements and product mentions from individuals with perceived expertise or social influence over a defined audience.

• Green/Eco-friendly Products: Products designed, produced or packaged in ways that reduce environmental harm relative to conventional alternatives.

• Awareness: The extent to which consumers possess knowledge of sustainable consumption practices and related product options, as communicated through digital marketing channels.