Conversation so far:
where is the largest quantity of inorganic carbon found
Inorganic carbon in our atmosphere in the form of CO2 is one of the largest sources of carbon in the world.
What is the concentration of CO2 in the atmosphere
the concentration of CO2 in 2009 was approximately 380 ppm, increasing by about 2 ppm per year. The concentration is constantly increasing since the industrial revolution, intensifying the greenhouse effect.

Question: where else can we find the gas
Self-contained rewrite: where else can we find concentration of CO2 gas