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This article discusses the regulation of hydrocarbon emissions, including the emissions of methane, a potent greenhouse gas, from the oil and gas industry in the western United States. It covers the regulations of the Environmental Protection Agency, the Bureau of Land Management, and other Federal agencies. It also discusses the state laws of the major oil and gas producing western states: California, Colorado, New Mexico, Utah, and Wyoming. It covers operations on public, state, and private lands, but it does not cover oil and gas operations on Indian lands that are the subject of the author’s previous article.