text: IRag= Certain gases will absorb different wavelengths of radiation (a characteristic of the light ) depending on the construction of the gas. Some gases do not absorb IR , there construction will not allow them to absorb the IR, they may absorb other forms of radiation but as was said above they still radiate IR. Many other materials including water will absorb IR. These should not be included in the term IRags. The words greenhouse gas effect has never been proven by creditable scientific experiments and therefore will only be used when absolutely necessary.