The concern about some gases is absorption-emission of energy (complicated subject but definition of ‘greenhouse gas’ is molecules that do that).
It’s the molecules that affect red end of light spectrum that are of great concern, whereas oxygen is at violet end.
Much flapping by catastrophists, methane has been a recent hobby horse.
The WattsUpWithThat.com website publishes articles refuting accusations against methane, claims of more severe weather, etc.
Realistically, the science is far from complete, especially in the primary heat reservoirs called ‘oceans’.
Meanwhile, weather balloons, satellite sensors, and tide gages show only a continuation of the slow temperature rise since the end of a cool era circa 1750AD. (The cool era that was a key factor in Viking farmers leaving southwest Greenland, where they’d come in the Medieval Warm Perio which was warmer than today and stable.)
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