Forestry-based carbon sequestration projects in some areas have potential for investment by the carbon market and risks to that investment through loss by natural disturbances are a key uncertainty in managing carbon credit allocations. Cortex developed a prototype risk-of-reversal calculator that dynamically estimated loss of carbon stocks through a sequestration project's investment time window, based on ecological factors present at the project site, and probabilistic models of natural disturbance effects. For a case study area in coastal BC, we demonstrated that such an approach could significantly improve the efficiency and lower the costs of carbon credit allotments to both carbon banks and to proponents.