diff --git a/AGCM.rc.tmpl b/AGCM.rc.tmpl
index 162aa713..7ecec33e 100644
--- a/AGCM.rc.tmpl
+++ b/AGCM.rc.tmpl
@@ -862,6 +862,8 @@ DIURNAL_BIOMASS_BURNING: yes
        RATS_PROVIDER: @RATS_PROVIDER   # options: PCHEM, GMICHEM, STRATCHEM (Radiatively active tracers)
        AERO_PROVIDER: @AERO_PROVIDER   # options: GOCART2G, MAM, none  (Radiatively active aerosols)
 ANALYSIS_OX_PROVIDER: @OANA_PROVIDER   # options: PCHEM, GMICHEM, STRATCHEM, GOCART
+        CH4_PROVIDER: @CH4_PROVIDER    # options: GOCART, RRG, none
+        CO2_PROVIDER: @CO2_PROVIDER    # options: GOCART, RRG, none
 
 
 # Flag for real-time forecasts (persisted SST) OGCM_IS_FCST: 1 (AMIP-Style Default: 0)
@@ -889,7 +891,8 @@ USE_SKIN_LAYER: @USE_SKIN_LAYER
 # Model Tuning Parameters (For CMIP5 recommended SOLAR_CONSTANT and CO2 values, use -1)
 # -------------------------------------------------------------------------------------
 SOLAR_CONSTANT: -1
-CO2:            -1
+CO2:            -1 # CO2 conc to use in RRTMG. -2 will use 3D CO2 imported from @CO2_PROVIDER set above. -1 will read from a table. >=0 sets ppmv
+RATS_DIAGNOSTICS:  # Set one or more LW diagnostic analysis for specific RATS in RRTMG (options: O3 CO2 CH4 N2O CFC11 CFC12 CFC22 CCl4)
 
 
 # Flags for SATSIM Output
diff --git a/gcm_setup b/gcm_setup
index f8b0e42c..d1752aed 100755
--- a/gcm_setup
+++ b/gcm_setup
@@ -1543,6 +1543,10 @@ EMISSIONS:
 # -------------
 set  RATS_PROVIDER   = PCHEM
 
+# Additional RATS settings for specific GHGs
+# ------------------------------------------
+set CH4_PROVIDER     = none
+set CO2_PROVIDER     = none
 
 #######################################################################
 #                  Confirm HEARTBEAT time for the model
@@ -2384,6 +2388,9 @@ s?@AERO_PROVIDER?$AERO_PROVIDER?g
 s?@OANA_PROVIDER?PCHEM?g
 s?@EMISSIONS?$EMISSIONS?g
 
+s?@CH4_PROVIDER?$CH4_PROVIDER?g
+s?@CO2_PROVIDER?$CO2_PROVIDER?g
+
 s^@DYCORE^$DYCORE^g
 s^@AGCM_GRIDNAME^$AGCM_GRIDNAME^g
 s^@OGCM_GRIDNAME^$OGCM_GRIDNAME^g