Explanation:

There are both natural and human sources of methane emissions. The main natural sources include wetlands, termites and the oceans. Natural sources create 36% of methane emissions. Human sources include landfills and livestock farming. But the most important source being the production, transportation and use of fossil fuels. Human-related sources create the majority of methane emissions, accounting for 64% of the total.Together these two sources are responsible for 60% of all human methane emissions. Other sources include landfills and waste (16%), biomass burning (11%), rice agriculture (9%) as well as biofuels (4%).

All of the above are correct. Methane is emitted by natural sources such as wetlands, as well as human activities such as leakage from natural gas systems and the raising of livestock. Natural processes in soil and chemical reactions in the atmosphere help remove CH4 from the atmosphere.
Anthropogenic sources
• industrial agriculture
• Enteric fermentation from livestock
• rice paddies
• coal mining
• coalbed methane
• municipal solid waste
• landfill gas
• municipal wastewater
• fossil fuel production

Natural sources
Wetland methane emissions