1. Gases absorb/emit IR light if they vibrate at the frequency of the light, and if its vibration has a dipole moment that affects the electric field. O2 and N2 are not greenhouse gases. All molecules of three or more atoms are IR active.
2. A greenhouse gas has a stronger impact on the radiative balance of the Earth if it interacts with light in the middle of the earthlight spectrum.
3. Band saturation: a greenhouse gas at relatively high concentration like CO2 will be less effective, molecule per molecule, than a dilute gas like methane.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.