Estimates of the Cost of Avoided Emissions. According to our results, preventing mangrove loss has the potential of reducing global emissions for a cost of roughly $4 to $10 ton−1 CO2 (Fig. 2A). Dividing the world’s mangroves into three regions by longitude (Fig. 1), we find that the Asia and Oceania region has the largest potential emissions offset supply, comprising roughly two thirds of potential global offset availability (Fig. 2D). The other two regions—Americas and the Caribbean (Fig. 2B) and Africa and the Middle East (Fig. 2C)—each supply approximately half of the remaining world supply.