How does CO2 reach the upper atmosphere?

Being more dense that air at sea level, how do CO2 emissions at low level reach the upper atmosphere and create the greenhouse effect?
I have a horrible feeling I'm missing something really obvious!

Answers:
The density of CO2 > density of O2, so you expect most CO2 near the ground.
Wind, heating and turbulence brings CO2 to higher levels.
This is an inversion

Th
Its lighter than air so it floats there
Its gets a cheap flight from Virgin and a goody bag on the flight!
CO2 is CarbonDioxide which is a Gas.

Gas rises through the atmosphere.
CO2 molecules diffuse throughout the atmosphere, molecules are flying throughout the atmosphere, turbulent air currents help greatly. Gravity has only a small effect on concentrations of heavier molecules at high altitudes.
Co2 is a gas and because it is a gas it combines with air .When air gets warmit rises and goes near Earths atmosphere.
Through the carbon cycle

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