The cost curve counters a number of myths about carbon abatement. For example, many assume that addressing GHG emissions would come at a cost to society. However, some 7 gigatons of the total potential abatement would earn a positive economic return due largely to savings in energy costs through, for example, more energy-efficient lighting or more fuel-efficient vehicles. The cost curve identifies 27 gigatons per year of potential CO2e abatement that is consistent with a target of stabilizing emissions below 550 parts per million by volume (ppmv) by 2030 for a marginal cost of under €40 per ton.