Methane, a powerful greenhouse gas which today accounts for at least a quarter of all anthropogenic climate change, has many different sources. The largest human-caused methane source is enteric fermentation, the digestive process in the animal farming industry, followed by oil and gas production, landfills, rice cultivation, wastewater, other agricultural sources, coal mining, agricultural manure, biomass, and stationary and mobile sources of anthropogenic methane emissions.
Stationary and mobile sources of methane being released into Earth´s atmosphere through human activity refers to combustion practices, with these accounting for an estimated one per cent of other than natural methane activity on Earth. It is a byproduct of burning fossil fuels and organic matter in order to transform these into energy and heat.
According to the GMI (Global Methane Initiative), which is part of the United States Environmental Protection Agency EPA, there will be a 15% increase of human-caused methane emissions by 2020. Moreover, according to EPA/GMI, methane mitigation (projects) include many benefits for the overall (global) environment, not only in terms of reducing excess odors, but also in terms of minimizing anthropogenic methane emissions which are at a large scale responsible for the greenhouse effect and climate change on Earth since industrialization.
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