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Mangroves Under Threat: Rising Sea Levels Compromise Global Carbon Sinks

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A new study warns that rising sea levels and extreme weather are impairing the carbon storage capacity of mangrove ecosystems. This shift from carbon sinks to potential carbon sources poses a significant challenge to global climate mitigation and coastal protection efforts.

Mangroves, often referred to as "blue carbon" ecosystems, are among the most efficient carbon sinks on Earth, sequestering carbon at rates significantly higher than terrestrial forests. However, a recent 2026 study has raised alarms, indicating that accelerating sea-level rise (SLR) and frequent extreme weather events are fundamentally altering their ability to store carbon globally. The research highlights that in regions like Southwest Florida, mangroves are struggling to recover from the dual onslaught of rising tides and intense hurricanes. When sea levels rise too rapidly, mangrove soils—which are rich in organic matter—can become permanently submerged. This leads to a phenomenon known as "peat collapse," where the lack of oxygen and increased salinity cause the soil to break down, releasing stored carbon dioxide and methane back into the atmosphere. Instead of acting as a buffer against climate change, these degraded ecosystems risk becoming net carbon sources.

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