New models of the dynamic patterns of carbon uptake by forest ecosyste
ms allow improvements in the estimation of the costs of carbon sequest
ration in the U.S. The preliminary results of an effort to update an e
arlier study indicate that conversion of environmentally sensitive and
economically marginal cropland and pastureland in the U.S. could offs
et as much as 25% of current U.S. emissions at costs of $US 8-60 per s
hort ton.