Both scenarios fall below the estimates of GHG emissions for anaerobic treatment of fecal sludge collected from pit latrines (gray region in Figure ). Conversely, the costs of both scenarios are greater than this benchmark system. For this analysis, estimates for pit latrines and transportation were adopted from the baseline treatment of mixed excreta (which also used pit latrines), while estimates for anaerobic treatment followed previous analyses. A wide variation in emissions (85 -115 kg CO2 eq•cap -1 •yr -1 ) and costs (2 -3 USD•cap -1 •d -1 ) from this benchmark sanitation system was estimated. This variation is due to the broad assumptions that were used which can greatly impact costs (e.g., emptying fee and period and capital costs) as well as emissions (e.g., emptying period and decay assumptions). The construction, operating conditions, and performance of pit latrines can greatly vary across contexts. Regardless of the broader variation in these results, OP in both scenarios has lower emissions at a higher cost.