CO2! Global warming, yadda yadda yadda.
Guess what? It doesn't work the way the news says.
CO2 absorbs a certain wavelengths of light. That makes the molecule heat up, and that heat is released as longer wavelengths or by transferring it to adjacent molecules. What this means for temperature is that it is transparent to frequencies transmitted by the sun and opaque to the re-emission from earth. That keeps heat from escaping back into space, or at least slows it.
The thing the media screws up is how much light the CO2 is stopping.
Lets say, for simplicity, that a given concentration of CO2 stops 50% of the light from escaping back into space. If we double the concentration how much light is stopped? It's not 100%. It's 75%. Triple it, you'd get 87.5%, quadruple gives 93.75%, five times gives 96.875% and so on. Notice the diminishing return?
The CO2 argument also ignores water. Lots of water up there. And water tends to absorb the same wavelengths as CO2.
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