It does not burn and will not support combustion of ordinary materials. Its weakly acidic aqueous solution is called carbonic acid. The gas, easily liquefied by compression and cooling, provides the sparkle in carbonated beverages.
Dough rises because of carbon dioxide formed by the action of yeast and baking powder.
Carbon dioxide is a raw material for Photosynthesis in green plants, and is a product of animal respiration and of the decay of organic matter. It can cause death by suffocation if inhaled in large amounts.