But that methane has always been there, not a spike. There are other processes that produce methane.
No significant oxygen. Without oxygen, methane is the lowest energy state for the existence of carbon and hydrogen.
Here on earth, the presence of oxygen takes them down to CO2 and H2O, unless an outside source, like a biological process, chemically combines them into a higher energy state. This allows us to use them as fuel.
Scientists mostly accept (I think), that the the massive amounts of methane on other planets and moons is non-biological in origin. Yet they cling to the theory that well over 90% of the methane on Earth is biological, i.e., like all of other oil and gas, it is a “fossil fuel”. Yet we keep finding more and more of it... But the “fossil fuel” theory has been important to the Left as it supports the idea that we are running out of fuel and need to go “green” and ride bicycles and take the bus and so forth...