Future carbon emissions from global mangrove forest loss

Abstract

Mangroves have among the highest carbon densities of any tropical forest. These “blue carbon” ecosystems can store large amounts of carbon for long periods, and their protection reduces greenhouse gas emissions and supports climate change mitigation. The incorporation of mangroves into Nationally Determined Contributions to the Paris Agreement and their valuation on carbon markets requires predicting how the management of different land-uses can prevent future greenhouse gas emissions and increase CO2 sequestration. Management actions can reduce CO2 emissions and enhance sequestration, but should be guided by predictions of future emissions, not just carbon storage. We project emissions and forgone soil carbon sequestration potential caused by mangrove loss with comprehensive global datasets for carbon stocks, mangrove distribution, deforestation rates, and drivers of land-use change. Emissions from mangrove loss could reach 2,397 Tg CO2eq by the end of the century, or 3,401 Tg CO2eq when considering forgone carbon sequestration. The highest emissions were predicted in southeast and south Asia (West Coral Triangle, Sunda Shelf, and the Bay of Bengal) due to conversion to aquaculture or agriculture, followed by the Caribbean (Tropical Northwest Atlantic) due to clearing and erosion, and the Andaman coast (West Myanmar) and north Brazil due to erosion. Together, these six regions accounted for 90% of the total potential CO2eq future emissions. We highlight hotspots for future emissions and the land-use specfic management actions that could avoid them with appropriate policies and regulation.

Mangrove sinkholes ( cenotes ) of the Yucatan Peninsula, a global hotspot of carbon sequestration

“…Thus, the capacity of these mangroves to continue accumulating SOC may become limited at high rates of sea-level rise. Avoiding emissions from these carbon hotspots could be achieved by protecting hydrological networks, avoiding clearing, facilitating inland migration and conducting hydrological restoration in degraded forests including those damaged by tropical storms [29]. These activities could provide economic incentives to the Mayan communities for the sustainable management of cenote s within the Yucatan Peninsula.…”

The role of mangroves in supporting shipping industry commitments to environmental protection and sustainable development

“…Sources: Tam and Wong 1994; Kaye 2019; Adame et al 2020;Alongi 2020;Pham et al 2019;Pham et al 2020) As a key economic sector both globally and in Vietnam, the shipping industry is facing many economic development and environmental protection challenges. Many policies have proposed technical, financial and ecological measures to support the shipping industry in achieving inclusive development goals.…”