> Breathing out CO2 adds zero net CO2 to the atmosphere, because it comes from food you ate, which itself came from CO2 in the atmosphere. For most of us that

> Breathing out CO2 adds zero net CO2 to the atmosphere, because it comes from food you ate, which itself came from CO2 in the atmosphere. For most of us that food probably took a considerable amount of fossils food to grow, package and transport.