I found this to be an interesting video. What goes on beneath the earth is very interesting. It shows how important CO2 is not only to the ants but if you expand your thoughts a little you can see how important it is to the entire world. Ask yourself where does wind come from...In our homes and offices we use fans.
The Heating and cooling of the earth creates natural airflow. 50% of the earth is always in darkness but CO2 also could play a part in natural airflow. Where does smoke from the forest fires really go?...There have been forest fires for millions of years. By now the earth should be like a smoke-filled bar.
Ants need fresh air so they create CO2. They are all set to inherit the earth.