Foregone ecosystem C sequestration per unit coal produced.

aValues are from Simmons et al. Table 5 [8]. Our reference to “Soil” is considered “total belowground” by the authors; our use of “biomass” is considered “total aboveground, as reported by the authors. Reported values for C pools were divided by stand age (15 yr) and converted to g C m−2 yr−1. bValues are calculated from Amichev et al. Table 1[9]. Reported values for C pools for all sites were divided by stand age and converted to gC m−2 yr−1. Our reference to “Soil” is considered “SOC” + “Litter Layer C”, as reported by the authors; our reference to “Biomass” is considered “Total Tree C”, as reported by the authors.