The US declined to contribute to a joint declaration reaffirming the group’s commitment to the Paris global climate agreement.
US energy secretary Rick Perry told his counterparts from Japan, Germany, Canada, France, Italy and the UK that America was reviewing its policies and "reserves its position on this issue".
Trump’s administration has yet to make a decision on whether to withdraw the US from the Paris agreement.
It was a promise made repeatedly during the campaign, but was not addressed by the recent executive order to review the country’s Clean Power Plan, a programme designed to lower carbon emissions in the US beyond 2022.
