We don’t convert oxygen into carbon dioxide. Through cellular respiration, similar to combustion, organic molecules are oxidized (release electrons) to form carbon dioxide. Those electrons lose energy that is stored in ATP, the molecule our bodies can then use to function. Oxygen accepts the de-energized electron and is thus reduced (gains electrons) to form water and complete the coupled redox reaction.
Thus, oxygen is converted to water, and the organic molecules we eat (carbohydrates, fats, proteins) are converted to carbon dioxide and usable energy.
One way to feel productive might be to learn the most basic biological processes critical to our lives. The carbon cycle is also extremely relevant due to increasing energy and climate concerns.
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