The United States looks to Colorado for methane emission policies.
Environmental regulators in the United States are set to base new guidelines for reducing methane emissions from oil and gas operations on the nation-leading practises of a state that has been reducing the potent greenhouse gas for seven years.
The restrictions, which could have significant ramifications for oil and gas drillers, are expected to be unveiled by the US Environmental Protection Agency.
The proposal, which will be rolled out just days before the start of the United Nations conference on global warming in Glasgow.
Methane is the second-biggest cause of climate change after carbon dioxide.
The state has strong environmental goals as well as a big oil and gas sector.