This set of changes introduces a new namelist setting that allows more control over fates history diagnostics. This setting, fates_history_dimlevel accepts two integers, comma-delimited, from 0-2. The first specifies the history output dimension level for high-frequency output (ie model timestep) and the second is for output at the dynamics timestep. A value of 0 indicates no history variables should be processed. A value of 1 indicates that only site-level mean values should be processed. A value of 2 indicates that all variables, including those that use an extra dimension should be processed. This is different from adding and excluding history variable names from the namelist, in that these settings not only omit variables from the output file, but they prevent their allocations and calculations all together. Processing history diagnostics in FATES takes a non-trivial amount of time.