According to the new research, livestocks noxious flatulence accounts for a large portion of the methane gas being released into the atmosphere.
Researchers say cows are producing twice as much methane gas as scientists previously believed.
The states producing the most methane gas were Texas, Oklahoma and Kansas
http://www.ibtimes.com/cow-farts-have-larger-greenhouse-gas-impact-previously-thought-methane-pushes-climate-change-1487502
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Termites are a significant natural source of methane. During the normal digestion process of a termite, methane is produced. Termites eat cellulose but rely on micro-organisms in their gut to digest it which produces methane during the process. This is responsible for 12% of natural methane emissions.[1]
Each termite produces very small amounts of methane on a daily basis. However, when this is multiplied by the world population of termites, their emissions add up to 23 million tonnes of methane annually.[1]