Nonsense.
Noensense is taking a fact based observation and avoiding answering it.
The CO2 moves cyclically, as per your graph.
Why?
co2 is one of the greenhouse gasses active in our atmosphere.
Is it the most powerful?
Are there other sources of CO2 in nature?
The fashion of dismissiveness is one of the least fashionable, even though it is one of the more popular.
Ed