What defines high quality?

Accurate assumptions over carbon sequestration levels and maximising successful mangrove survival.

When a mangrove is cleared the exposed sediment emits carbon dioxide at around 7 tonnes per hectare per year as a result of microbial activity (Attwood et al. 2017: Lovelock et al. 2011). The only way to stop these emissions is for the hydrology of the site to be restored and mangrove forest cover established. If the mangroves aren’t restored, then over a 25 year period the carbon in the sediment will be reduced by around 200 tonnes per hectare. The carbon methodology developed by rePLANET and submitted to Plan Vivo as a methodology includes this avoided loss carbon, defined as Net Residual Carbon. Most carbon accounting methodologies do not include this key element and as a result the true carbon value of the restored mangroves is undervalued. The Net Residual Carbon credits are issued at the point of planting whilst the Above Ground Biomass (AGB), Below Ground Biomass (BGB) and additional accretion of sediment caused by the planting are then issued ex-post in 5-year intervals as the carbon accumulates.

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