Answer:
C. Â CO2 exists in relatively high concentrations. Â
Explanation:
From the available options:
A. Â CO2 molecules are highly symmetrical. Â
B. Â CO2 has a low molar mass. Â
C. Â CO2 exists in relatively high concentrations. Â
D. Â CO2 is formed in the combustion of fossil fuels. Â
The focus on CO2 as far as global warming is concerned is not because It has a high global warming potential but because of its relatively high concentration in the atmosphere as a result of both natural and anthropological activities.
The correct option is C.