I know that the primary way that CO2 leaves the body is through exhalation. Is there any other way in which CO2 leaves the body? I think the only other way is through farts since CO2 is a gas and it must leave the body as a gas, since it becomes a solid at about -78 degrees Celsius. Does CO2 really leave the body through farts? Is there any other way that I didn't account for by which CO2 leaves the body?