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One of the primary producers of this methane are cattle and other livestock. When these cattle break wind, or fart, they release a large amount of methane into the atmosphere.
smartmoves.questacon.edu.au...
The Mars Express orbiter has detected minute traces of methane in the Martian atmosphere, a finding that could point to volcanic activity or fermenting microorganisms.
Both of those phenomena, along with a third mooted methane source (hydrothermal activity) remain among the big unknowns about Mars.