 A 2013 study estimated that livestock accounted for 44% of human-induced methane and ~15% of human-induced greenhouse gas emissions.Many efforts are underway to reduce livestock methane production, such as medical treatments and dietary adjustments, and to trap the gas to use as energy.Most of the subseafloor is anoxic because oxygen is removed by aerobic microorganisms within the first few centimeters of the sediment.