Integrity as a Normative Value? The Role of Nature-Based Solutions in the Evolving Standards Under Article 6 of the Paris Agreement

Nature-based solutions (NbS) for climate change mitigation hold significant potential to address multiple environmental challenges while reducing greenhouse gas emissions. However, current efforts and financial flows toward NbS fall short of the scale necessary to achieve a meaningful impact. Within the context of the United Nations Framework Convention on Climate Change (UNFCCC), NbS has been a contentious topic, raising concerns over potential environmental and social risks. Under the new international carbon market mechanism, it is envisaged that mandatory environmental safeguards set forth by the Sustainable Development Tool (SD Tool) will serve as a critical framework for ensuring that Emission Reductions (A6.4ERs) under Article 6.4 are credible and environmentally sustainable. The safeguards within the SD Tool are also expected to facilitate the integration of Article 6.4 mechanisms into national policies and enhance bilateral agreements for Internationally Transferred Mitigation Outcomes (ITMOs) under Article 6.2. This article examines the potential of the SD Tool in safeguarding environmental integrity, drawing comparisons to existing mechanisms such as the Clean Development Mechanism (CDM) SD Tool, REDD+ safeguards, and Green Climate Fund (GCF) safeguards. It preliminarily concludes that while the Article 6.4 SD Tool introduces important advancements in environmental safeguard standards, its effectiveness will depend on rigorous implementation, transparency, and accountability measures. Ultimately, this paper argues that embedding robust environmental safeguards within international market mechanisms is essential to prevent the dilution of environmental integrity and to ensure that NbS contribute meaningfully to climate goals without compromising environmental values.