Because the degree of emissions triggered by land conversions in a particular location is only partially understood, we construct low and high estimates of potential offset supply to correspond to the range of approaches taken by recent studies (8, 15). Our central estimate is the midpoint of the range. Logically, the cases with low and high emissions profiles lead to a lower and greater potential supply of emissions offsets, respectively, in terms of both the total potential supply and the supply for given price per ton CO2.