O4-Review.md

@@ -318,9 +318,8 @@ When task is complete please update the table with the link to the result plots.
 
 ## Energy/carbon footprint of review
 
-
-| Job                 | Walltime [hr] | CPU Runtime [hr] | CO2^  |
-|---------------------|---------------|------------------|-------|
+| Job                 | Walltime [hr] | CPU Runtime [hr] | kg CO2^ |
+|---------------------|---------------|------------------|---------|
 | GW150914 (run a)    |               |                  |         |
 | GW150914 (run b)    |               |                  |         |
 | GW190425            |               |                  |         |