| http://www.w3.org/ns/prov#value | - Although the accuracy of GHG emission estimates from natural gas production and usage is still a matter of debate [4, 5], natural gas, which is composed mainly of methane, is considered cleaner-burning than coal or oil with significantly lower levels of carbon dioxide, nitrogen oxides (NOx), sulfur dioxide, and particles emission when combusted.The United States is the largest natural gas producer
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