How is Human Activity affecting the Composition of Air?

-More Humans = More Respiration = More Carbon Dioxide. Simple -More Humans also mean more Energy is needed for their Modern Lives, like Heating and Cooking. Lifestyles also are Changing, in a Better-Off Way. This means, from an Individual Aspect, more Energy is being used per Person. -And most of the Energy comes from Fossil Fuels, which releases Carbon Dioxide -More People also means more Land is Needed, so Deforestation takes place for Housing which Decreases Carbon Dioxide and Water Vapor Absorption, and Decreases Oxygen Levels.