Rename C02 column and fix it

src/display/utils.py

@@ -128,7 +128,7 @@ auto_eval_column_dict.append(["fullname", ColumnContent, ColumnContent("fullname
 auto_eval_column_dict.append(["generation", ColumnContent, ColumnContent("Generation", "number", False)])
 auto_eval_column_dict.append(["base_model", ColumnContent, ColumnContent("Base Model", "str", False)])
 
-auto_eval_column_dict.append(["co2_emissions_kg", ColumnContent, ColumnContent("CO2 cost (kg)", "number", True)])
+auto_eval_column_dict.append(["co2_emissions_kg", ColumnContent, ColumnContent("CO₂ cost (kg)", "number", True)])
 
 # We use make dataclass to dynamically fill the scores from Tasks
 AutoEvalColumn = make_dataclass("AutoEvalColumn", auto_eval_column_dict, frozen=True)