Why is CO2 a good and a bad gas? Carbon dioxide CO2 CO2 carbon dioxide CO2 carbon dioxide CO2 Why is CO2 a good and a bad gas? CO2 carbon dioxide carbon dioxide Co2 CO2 Why is CO2 a good and a bad gas? Why is CO2 a good and a bad gas? Why is CO2 a good and a bad gas? CO2 carbon dioxide CO2 carbon dioxide carbon dioxide Why is CO2 a good and a bad gas? Carbon dioxide