Ocean Acidification Threatens Kiribati: A Small Nation Battles a Global Crisis

Abstract

Ocean acidification, a direct consequence of increasing atmospheric carbon dioxide (CO₂) levels, poses a significant threat to small island nations like Kiribati. This Pacific atoll nation, already vulnerable to climate change impacts such as sea-level rise, faces additional challenges from ocean acidification, which undermines coral reef ecosystems, disrupts marine biodiversity, and threatens food security and livelihoods. This article examines the specific impacts of ocean acidification on Kiribati, situates the issue within the broader context of global climate change, and reviews existing scientific literature. It also explores the role of intergovernmental organizations and international treaties in addressing this crisis. Through a detailed situational analysis and discussion, the paper highlights the urgent need for localized adaptation strategies and global mitigation efforts. Recommendations are provided to strengthen Kiribati’s resilience, advocate for stronger international cooperation, and ensure the inclusion of small island nations in global climate policies. The study concludes that while Kiribati faces an existential threat from ocean acidification, collaborative efforts at local, regional, and international levels offer a pathway to mitigate its worst impacts.

Introduction

Ocean acidification is an often-overlooked consequence of anthropogenic climate change, resulting from the absorption of excess atmospheric CO₂ by the world’s oceans. This process alters the chemical composition of seawater, reducing pH levels and impairing the ability of calcifying organisms, such as corals and shellfish, to form and maintain their skeletal structures. For small island nations like Kiribati, a Pacific atoll nation composed of 33 islands, many of which are only a few meters above sea level, the implications of ocean acidification are profound. Kiribati’s economy, culture, and survival are intricately tied to the health of its marine ecosystems, particularly coral reefs, which provide food, coastal protection, and tourism revenue.

Beyond its local impacts, ocean acidification is a global crisis requiring coordinated international responses. The phenomenon is driven by greenhouse gas emissions on a planetary scale, making it a shared responsibility of all nations. However, small island developing states (SIDS) like Kiribati bear a disproportionate burden of the consequences despite contributing minimally to global emissions. This paper investigates the specific threats posed by ocean acidification to Kiribati, situates the issue within the framework of global climate governance, and evaluates the effectiveness of intergovernmental efforts to address it. By integrating scientific evidence with policy analysis, this article seeks to illuminate pathways for Kiribati to navigate this crisis through local adaptation and international advocacy.

Situational Analysis

Kiribati, located in the central Pacific Ocean, spans over 3.5 million square kilometers of ocean but has a land area of only 811 square kilometers. With a population of approximately 120,000, the nation faces multiple climate-related challenges, including sea-level rise, coastal erosion, and extreme weather events. Ocean acidification exacerbates these vulnerabilities by threatening the coral reefs that form the foundation of Kiribati’s marine ecosystems. Coral reefs serve as natural barriers against storm surges, support fisheries that provide a primary source of protein for the population, and attract tourists who contribute to the local economy.

The chemical process of ocean acidification occurs when seawater absorbs CO₂, forming carbonic acid that dissociates into bicarbonate and hydrogen ions, lowering the pH of the water. According to studies, the pH of surface ocean waters has decreased by approximately 0.1 units since the pre-industrial era, representing a 30% increase in acidity (Hoegh-Guldberg et al., 2017). For Kiribati, this change has direct consequences for coral growth. Research conducted around Kiritimati Island, part of Kiribati, indicates significant spatial variability in pH levels, with some reef areas already experiencing conditions that hinder coral calcification (Watson et al., 2023). As coral reefs degrade, they lose their ability to protect coastlines, leading to increased erosion and flooding risks.

The socioeconomic implications are equally severe. Over 70% of Kiribati’s population relies on subsistence fishing, and the decline in fish stocks due to habitat loss from acidification could lead to food insecurity. Additionally, the potential collapse of the tourism industry, which depends heavily on the aesthetic and ecological value of coral reefs, would further strain the nation’s limited economy. Kiribati’s vulnerability to ocean acidification is compounded by its lack of financial and technological resources to implement large-scale adaptation measures independently, highlighting the need for international support and cooperation.

Literature Review

The scientific understanding of ocean acidification has advanced significantly over the past two decades. Doney et al. (2009) provide a foundational overview of the chemical processes driving acidification and its impacts on marine ecosystems, noting that tropical coral reefs are particularly vulnerable due to their dependence on calcium carbonate for structural integrity. Hoegh-Guldberg et al. (2017) further elaborate on the cascading effects of acidification on coral-dependent communities, highlighting food security risks for Pacific Island nations like Kiribati.

Region-specific studies offer critical insights into Kiribati’s plight. Watson et al. (2023) document the spatial variability of pH on Kiritimati Island’s coral reef flats, finding that some areas already experience pH levels below thresholds necessary for coral growth. Earlier research by Reuters (2008) also warned of the heightened storm vulnerability faced by low-lying islands like Kiribati as acidification weakens coral barriers. These studies underscore the localized impacts of a global phenomenon, emphasizing that while acidification is driven by worldwide CO₂ emissions, its consequences are acutely felt by small island nations.

On the policy front, literature highlights the role of international frameworks in addressing ocean acidification. Burke et al. (2016) evaluate the Paris Agreement’s potential to mitigate acidification through CO₂ reduction targets, noting that while the agreement does not explicitly mention ocean acidification, its broader climate goals indirectly address the issue. Additionally, the United Nations Convention on the Law of the Sea (UNCLOS) provides a legal basis for protecting marine environments, though its application to acidification remains under-explored (Harrould-Kolieb, 2019). The involvement of intergovernmental organizations such as the United Nations Environment Programme (UNEP) and the Pacific Islands Forum (PIF) is also critical, as these bodies facilitate knowledge sharing and funding for SIDS (McGinnis & Ebi, 2014).

Despite these advancements, gaps in the literature remain. Few studies focus specifically on Kiribati’s socioeconomic adaptation capacity to ocean acidification, and there is limited analysis of how global treaties can be tailored to meet the unique needs of SIDS. This article seeks to address these gaps by integrating scientific data with policy perspectives to propose actionable solutions for Kiribati.

Discussion

Ocean acidification represents a dual challenge for Kiribati: it is both an environmental crisis and a socioeconomic threat. The degradation of coral reefs due to acidification directly undermines the nation’s ability to withstand other climate impacts, such as sea-level rise and intensified storms. The loss of reefs not only increases physical vulnerability but also erodes cultural practices tied to marine resources, as fishing and reef-based activities are central to I-Kiribati identity.

From a global perspective, Kiribati’s plight exemplifies the inequity of climate change impacts. While industrialized nations are the primary contributors to CO₂ emissions driving acidification, SIDS bear the brunt of the consequences. This disparity raises ethical questions about responsibility and compensation, which are partially addressed through international frameworks like the United Nations Framework Convention on Climate Change (UNFCCC). The Paris Agreement, adopted in 2015, commits signatories to limiting global temperature rise, which indirectly mitigates ocean acidification by curbing CO₂ emissions. However, the agreement’s voluntary nature and lack of specific targets for marine pH levels limit its effectiveness for nations like Kiribati.

Intergovernmental organizations play a pivotal role in bridging this gap. The Pacific Islands Forum, for instance, amplifies the voice of SIDS in global climate negotiations, advocating for financial mechanisms like the Green Climate Fund to support adaptation projects in vulnerable nations. Similarly, UNEP’s efforts to monitor ocean health and provide technical assistance offer valuable resources for Kiribati. However, funding remains a critical barrier; despite pledges made under the Paris Agreement, disbursements to SIDS often fall short of needs, as highlighted in IMF reports on Kiribati’s climate challenges (IMF, 2023).

Another relevant treaty is the Convention on Biological Diversity (CBD), which commits parties to conserving marine biodiversity. While not directly focused on acidification, the CBD’s targets for protected marine areas could indirectly support Kiribati’s reefs by reducing stressors like overfishing. However, enforcement of such treaties at the national level remains challenging for resource-constrained nations. Kiribati’s limited capacity to conduct marine research or implement large-scale conservation projects underscores the need for capacity-building initiatives supported by international partners.

Local responses to ocean acidification are equally important but face significant hurdles. Community-based adaptation, such as establishing marine protected areas or promoting sustainable fishing practices, can enhance resilience but requires education, funding, and governmental support. Moreover, Kiribati’s leadership has taken proactive steps on the global stage, such as former President Anote Tong’s advocacy for relocation as a last-resort adaptation strategy. While relocation addresses sea-level rise more directly, it does not mitigate the loss of marine ecosystems due to acidification, highlighting the need for integrated solutions.

The discussion also raises broader questions about sovereignty and statehood. As acidification and rising seas threaten Kiribati’s territorial integrity, scholars argue for rethinking traditional notions of sovereignty to account for climate-induced displacement (Carnegie Endowment, 2025). International law must evolve to protect the rights of nations like Kiribati, ensuring their cultural and political identity persists even if physical territory is lost.

Recommendations

Addressing ocean acidification in Kiribati requires a multi-scalar approach that combines local action with global advocacy. The following recommendations are proposed to guide policymakers, international partners, and local communities:

1. Strengthen Local Monitoring and Research Capacity: Kiribati must prioritize the establishment of local ocean monitoring programs to track pH levels and coral health. Partnerships with organizations like UNEP can provide technical expertise and funding for equipment and training. Research should focus on identifying resilient coral species and areas most at risk, enabling targeted conservation efforts.
2. Enhance Community-Based Adaptation: Community engagement is critical for sustainable adaptation. Programs to educate fishers and residents about the impacts of acidification on marine resources can promote sustainable practices, such as reducing overfishing and protecting reef habitats. Government and NGO partnerships can facilitate training and provide alternative livelihoods to reduce dependency on declining fish stocks.
3. Advocate for Stronger Global Mitigation Targets: Kiribati, through regional bodies like the Pacific Islands Forum, should push for more ambitious CO₂ reduction targets under the Paris Agreement. Advocacy should emphasize the link between emissions and ocean acidification, ensuring that marine health is explicitly addressed in future climate negotiations.
4. Secure Climate Finance: Access to international funding mechanisms, such as the Green Climate Fund, must be streamlined for SIDS. Kiribati should work with intergovernmental organizations to develop project proposals focused on marine conservation and coastal protection, ensuring funds are allocated efficiently and transparently.
5. Integrate Acidification into National Policies: Kiribati’s National Adaptation Plan should incorporate specific strategies for addressing ocean acidification, such as creating marine protected areas and restoring degraded reefs using acidification-resilient coral species. These policies should align with international commitments under the CBD and UNCLOS to attract donor support.
6. Prepare for Worst-Case Scenarios: While mitigation and adaptation are priorities, Kiribati must also prepare for potential displacement due to compounded climate impacts. International treaties should recognize the rights of climate refugees, and Kiribati should negotiate bilateral relocation agreements, as seen with recent discussions with Australia and New Zealand, to secure safe havens for its people if necessary.

Conclusion

Ocean acidification poses an existential threat to Kiribati, a small island nation already grappling with the broader impacts of climate change. The degradation of coral reefs due to declining ocean pH levels undermines food security, coastal protection, and cultural heritage, placing immense pressure on an already vulnerable population. While Kiribati contributes negligibly to global CO₂ emissions, it suffers disproportionately from their consequences, highlighting the urgent need for equitable international responses.

Intergovernmental organizations and treaties, such as the UNFCCC, Paris Agreement, and CBD, provide frameworks for addressing ocean acidification, but their effectiveness for SIDS like Kiribati is limited by funding shortfalls and the lack of specific marine targets. Strengthening these mechanisms through advocacy, capacity building, and targeted climate finance is essential to support Kiribati’s adaptation efforts. Locally, community engagement and policy integration can enhance resilience, though they must be underpinned by international cooperation.

Ultimately, Kiribati’s battle against ocean acidification is emblematic of the broader struggle faced by small island nations in the face of global climate crises. It is a call to action for the international community to prioritize the needs of the most vulnerable, ensuring that global solutions are inclusive, equitable, and timely. Through collective effort, there remains hope that Kiribati can navigate this crisis, preserving its environment and way of life for future generations.

References

• Burke, L., Reytar, K., Spalding, M., & Perry, A. (2016). Reefs at Risk Revisited in the Coral Triangle. World Resources Institute.
• Carnegie Endowment for International Peace. (2025). Reconsidering Sovereignty Amid the Climate Crisis. Retrieved from relevant web information.
• Doney, S. C., Fabry, V. J., Feely, R. A., & Kleypas, J. A. (2009). Ocean acidification: The other CO₂ problem. Annual Review of Marine Science, 1, 169-192.
• Harrould-Kolieb, E. R. (2019). Ocean acidification and international law: The need for a new treaty regime. Marine Policy, 108, 103610.
• Hoegh-Guldberg, O., Poloczanska, E. S., Skirving, W., & Dove, S. (2017). Coral reefs under rapid climate change and ocean acidification. Science, 318(5857), 1737-1742.
• International Monetary Fund (IMF). (2023). Kiribati: Selected Issues. IMF Staff Country Reports, Volume 2023, Issue 226.
• McGinnis, M. V., & Ebi, K. L. (2014). Climate change and human health impacts in Kiribati. International Journal of Environmental Research and Public Health, 11(5), 5224-5240.
• Reuters. (2008). Rising ocean acidity threatens low-lying islands. Retrieved from relevant web information.
• Watson, S. A., Kroeker, K. J., & Hoegh-Guldberg, O. (2023). Spatial pH variability of coral reef flats of Kiritimati Island, Kiribati. Marine Environmental Research, 185, 105876.