Increased atmospheric concentrations of carbon dioxide (CO₂) are thought to lead to climate change and have spawned national and international policies to slow down the rate of CO₂ emissions. Forests can play a role in reducing atmospheric concentrations of CO₂ as they are a global C sink. The stock of C sequestered in the standing forest and its soils increases with increasing forest biomass over time. Old growth forests, which may have large stocks of C, may exhibit reduced C sequestration rates since net biomass growth is modest or negligible. In contrast, a young forest may have a relatively modest stock of C due to its small total biomass, but these ecosystems sequester C at a fast rate due to rapid growth of juvenile trees. There has been considerable interest in using economic incentives to reduce atmospheric concentrations of CO₂ through the development of a C-credits market. If changes in forest management can generate C credits at a cost competitive with credits from other sectors of the economy this could present a new opportunity for selling an additional commodity from Wyoming's forests. This study examines the economic costs of creating C credits using a range of different forest management practices in ponderosa and lodgepole pine ecosystems in Wyoming. The C sequestration potential of four management practices (control, uneven aged, even aged and heavy harvest) were calculated for a ponderosa pine ecosystem.  These results will be combined with cost and return data for each management practice to evaluate the economic costs of creating C credits using each management type.