Why is there very little methane in Earth's atmosphere compared to the amount of carbon dioxide

Methane is 84 times more potent than carbon dioxide. Methane absorbs heat and in effect can be devastating to climate

While methane doesn't linger as long in the atmosphere as carbon dioxide, it is initially far more devastating to the climate because of how effectively it absorbs heat. In the first two decades after its release, methane is 84 times more potent than carbon dioxide.