This discussion focuses on the daily carbon dioxide production of humans and the oxygen output of plants. It is established that an average person exhales approximately 1 kg of carbon dioxide per day, influenced by activity levels. The carbon dioxide produced by humans is part of a closed loop, as it originates from carbon absorbed by plants during photosynthesis. Various experimental methods, such as calorimetry, are utilized to measure these gas exchanges, and different plant species indeed produce varying amounts of oxygen.
PREREQUISITESThis discussion is beneficial for biologists, environmental scientists, and anyone interested in the dynamics of carbon dioxide and oxygen in ecological systems.
Q. Should we be concerned with human breathing as a source of CO2?
A. No. While people do exhale carbon dioxide (the rate is approximately 1 kg per day, and it depends strongly on the person's activity level), this carbon dioxide includes carbon that was originally taken out of the carbon dioxide in the air by plants through photosynthesis - whether you eat the plants directly or animals that eat the plants. Thus, there is a closed loop, with no net addition to the atmosphere.