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The FLIR camera shows both heat and CO2. In order to see CO2, we have to blind the FLIR camera to all that it can see, except for a very small portion of the electromagnetic spectrum. Think of it as a glass that only lets one shade of green through. This is known as a band pass filter. Since we know that CO2 has a “shade of color” in the 4 micron range, we can use a band pass filter in that range, and this will result in images that appear brighter and darker in otherwise homogeneous areas when CO2 is present in various concentrations. We still see heat, but the heat we see is dimmed and brightened by the presence of the CO2. This is known as signal attenuation.