Average distance from the surface of the earth to greenhouse gases?

Question

Average distance from the surface of the earth to greenhouse gases?

Answer 1

To know more about    

Green House                          

please feel free to visit   http://learnmoreon.com/greenhouse

Answer 2

Green house gases such as methane and carbon dioxide are actually more concentrated below the surface than they are in the atmosphere.  

But how far is it from the surface of the Earth to the atmosphere?  Since CO2 and methane are mixed in the atmosphere at all levels then the distance is zero.

Answer 3

1 mm

The greenhouse gases are in all the atmosphere, all the way down to the surface of the earth.

Answer 4

Zero

Where do you think they are?