2.2A Sources of methane The atmosphere of earth 2)a major component of the natural gas 3) Living organisms 4 Coal. ocean trenches in mud. in sewage. and in cows'stomachs2.2A Sources of Methane 1) The atmosphere of earth 2) a major component of the natural gas 3) Living organisms 4) Coal, ocean trenches, in mud, in sewage, and in cows’ stomachs