Abstract

Sustainable apparel brands increasingly employ environmental claims to differentiate themselves in markets shaped by climate concern, consumer skepticism, and heightened scrutiny of greenwashing. Nature-based claims, particularly tree planting and ecosystem restoration, are attractive because they are tangible, emotionally resonant, and easy to communicate. However, the number of trees planted does not, by itself, demonstrate durable climate, biodiversity, or community outcomes. This article examines how sustainable apparel brands can move nature-based sustainability claims from activity-based storytelling to verified impact reporting. It uses a conceptual, illustrative case-based analysis of Tentree, a Canadian sustainable apparel brand, drawing on literature on sustainable fashion, greenwashing, consumer trust, nature-based solutions, and sustainability assurance. The analysis identifies five requirements for credible nature-based claims: clear claim definition, transparent evidence, independent verification and assurance, outcome-based reporting, and accountability for limitations and risks. Tentree’s 2024 Impact Report demonstrates meaningful progress through specific tree-planting figures, restoration partnerships, sustainability certifications, carbon-footprint reporting, material traceability, and emerging nature-related disclosure commitments. The case also indicates that future credibility could be strengthened through consistent project-level disclosure of survival rates, carbon and biodiversity outcomes, evidence of additionality, leakage-risk assessment, and corrective actions for restoration projects that underperform. The article contributes to sustainable marketing and corporate sustainability literature by distinguishing activity-based claims from outcome-based impact reporting and by offering practical guidance for more transparent, verified sustainability communication.

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