Threat to Blue Carbon Ecosystems
These ecosystems store between 10 and 24 billion metric tons of carbon, adding another 30 to 70 million metric tons annually. Despite this, they are under threat, with significant losses since the 1800s due to development pressures and climate change. Globally, it's estimated that 50% of salt marshes, 35% of mangroves, and 29% of seagrass meadows have been degraded or lost since the mid-20th century.
Impact of Human Activities on Blue Carbon Ecosystems
Climate change has amplified the severity of hurricanes and storms that damage these ecosystems, while sea-level rise and urban development reduce their space. Large areas of these ecosystems have also been destroyed or harmed by commercial activities, such as aquaculture and agriculture. These practices not only obliterate blue carbon ecosystems but can also trigger the release of stored carbon. For instance, when mangroves are converted into shrimp ponds, approximately 60% of the original mangrove carbon stocks are released into the atmosphere.
Role of Blue Carbon Ecosystems in Climate Change Mitigation
Protecting and restoring these habitats can help mitigate climate change. Carbon offsets provide financial incentives for such projects, benefiting both the environment and local communities. However, up to 7% of blue carbon sinks are lost annually due to degradation. Restoration can remove CO2 from the atmosphere.
Ecological Benefits of Blue Carbon Ecosystems
These ecosystems also offer numerous ecological benefits. They serve as habitats for diverse organisms, support subsistence livelihoods, boost commercial fisheries' productivity, stabilize shorelines, and preserve water quality. Recognizing coastal blue carbon in each nation's Nationally Determined Contributions allows a wider range of nations to earn carbon credits.
Policy Recommendations for Blue Carbon Ecosystems
Policies encouraging restoration, local land-use, and reliable carbon sequestration measurement are needed. If we persist on this trajectory, we risk losing one of our most potent allies in tackling the climate and biodiversity crises. Moreover, coastal communities, particularly in small island and developing nations, stand to lose a vital resource that they rely on for livelihoods, food and water security, and resilience to climate impacts.
Harnessing the Power of Blue Carbon Ecosystems
To protect and harness the power of blue carbon ecosystems, it's crucial to ensure projects deliver promised environmental impacts and benefits equitably. This can be achieved by adhering to international best practices, safeguarding local and indigenous rights, and diversifying blue carbon finance pathways.
Best Practices and Financing Pathways for Blue Carbon Projects
Best practices guidelines, such as those from the UNFCCC Climate Champions, can guide project developers and governments towards sustainable outcomes. Blue carbon projects should be inclusive, considering all stakeholders, including government, civil society, and local and Indigenous groups. Finance pathways should be expanded beyond carbon credits to include non-market financing approaches, such as public or philanthropic funds. Blue carbon projects can significantly contribute to addressing climate change and biodiversity crises while supporting sustainable development, provided we invest in them and the communities that make them successful.
