The US is set to announce measures to prevent millions of tonnes of the greenhouse gas methane from entering the atmosphere.
The measures will target methane leaking from oil and gas rigs across the US.
A global partnership to cut methane is to be announced at the COP26 climate conference in Glasgow on Tuesday.
Dozens of countries have joined the initiative led by the US and the EU to cut emissions of the gas by at least 30% by 2030, compared with 2020 levels. However, China, Russia and India - some of the world's top methane emitters - are not among them.
The main focus of efforts to curb global warming has for decades been carbon dioxide (CO2), emitted as a result of human activities such as generating power and clearing forests.
But there has been a growing focus on methane which warms the atmosphere faster than CO2.
Under the Methane Emissions Reduction Action Plan, the Environmental Protection Agency (EPA) will propose new regulations that will broaden and strengthen methane emissions reduction for new oil and gas facilities.