The concentration of oxygen and carbon dioxide in the atmosphere are inversely related. As the concentration of carbon dioxide increases, the concentration of oxygen decreases. This is because carbon dioxide is a product of respiration and combustion, and oxygen is consumed in these processes. Additionally, carbon dioxide can react with water to form carbonic acid, which can dissolve in the ocean and reduce the amount of oxygen available to marine life. As a result, the increasing concentration of carbon dioxide in the atmosphere is leading to a decrease in the concentration of oxygen.