Good.
Actually, it is hard to get “too little” carbon dioxide, as naturally occurring phenomena tend to restore the CO2 balance. As the CO2 is used up, plants, which normally convert water and carbon dioxide into carbohydrates and free oxygen, revert from the formation of carbohydrates to the metabolic breakdown of these various polysaccharides back into carbon dioxide and water again. The natural order of the life cycle breaks proteins, cellulose and other forms of organic matter back down into carbon dioxide, hydrogen sulfide, water, and ammonia, which are used to recreate these same compounds as new proteins, new carbohydrates, and even as fats or oils, all of which are energy storage mediums.
There is a cruel economy which tends to conserve the existing balance very close to the norms which have persisted on earth for millions of years, since oxygen and nitrogen became the dominant atmospheric gases.
Only extreme cold conditions actually reduces atmospheric carbon dioxide, because at very low overall temperatures, carbon dioxide combines with water at greater concentrations than at warmer overall temperatures. So the hydrosphere takes over and holds the carbon dioxide that is “lost” from the atmosphere. The net amount of carbon dioxide remains roughly the same.