How can CO2 stay up in the atmosphere?
The molar mass of air is about 29 g/mol, the molar mass of CO2 is about 44 g/mol. How can CO2 then be a greenhouse gas staying up in the atmosphere and reflecting the heat?

CONTEXT(Help)
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Anthropogenic Climate Change »Anthropogenic Climate Change
Is the Earth's climate changing? »Is the Earth's climate changing?
How can CO2 stay up in the atmosphere?
The fact is that CO2 does mix in the air.  »The fact is that CO2 does mix in the air.
CO2 mass is relevant but outweighed by dynamic mixing »CO2 mass is relevant but outweighed by dynamic mixing
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